Not sure if this should go in error or simulation, let me know if I should change it.
I am trying to simulate the forces of bolts on a snare drum rim. I have 50lb forces on washers above each of the ten holes in the rim and have the face that the rim contacts with the snare shell as a fixed surface. I keep getting this error message when I try to run the simulation. I have the mesh rolled all the way to fine on the scroller bar and global contact interactions. The only thing that I can think of that might be fishy is the surface that the washers are sitting on is not perfectly flat (see second picture), but they are mated to it tangentially and concentric with the bolt holes.
This is for a school project I have been working on for a while and any help is greatly appreciated.
Error message after running to 36.4%. It says under defined, but I have since fully defined (washers could freely spin) and am still having the same error
Side profile showing curved surface

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LOS ANGELES, March 21, 2023 (GLOBE NEWSWIRE) -- via InvestorWire – IBN , a multifaceted communications organization engaged in connecting public companies to the investment community, is pleased to announce the release of the latest episode of The Bell2Bell Podcast as part of its sustained effort to provide specialized content distribution via widespread syndication channels.
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Join IBN’s Stuart Smith and Pat Ryan, Chairman and CEO of Ucore Rare Metals Inc. (TSX.V: UCU) (OTCQX: UURAF) , to learn more about the company’s efforts to secure relationships with downstream customers, as well as its goals for the coming months.
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Index: Introduction; K-dramas are meant first (or primarily) for Korean viewers and only second for international viewers; A. The historical figures who were fictionalized in this drama; the rivalry between the Andong Kim and Poonyang Jo clans and “sedo politics” (royal in-law politics); lawsuit filed by descendants of a historical figure against “The Princess’s Man”; connections of “Mr. Queen” to “Moonlight Drawn By Clouds” aka “Love in the Moonlight” and to “Kingdom” Season 2, Ep. 4; B. Eps. 8 and 10: Persecution of Catholics during the Joseon Dynasty; the only K-drama I’ve seen that depicted the Catholic persecution in Joseon Korea is “Yi San, Wind in the Palace” (2007); C. Ep. 8: Korean seesaw (“neolttwigi”); D. Ep. 12: Surit-nal (Dano Festival); ceremonial robes and head gear of Joseon kings; E. Ep. 14: Ice as a valuable commodity during the Joseon Dynasty; F. Ep. 14: Donghak (religion, movement, peasant revolution); G. Ep. 16: Difference between “Jo” and “Jong” in the posthumous (temple) names of the Joseon kings; the Joseon kings’ royal portraits and dramas such as “Painter of the Wind” and “Saimdang”; H. Ep. 16: Secret Royal Investigators during the Joseon Dynasty; secret royal inpectors as depicted in “100 Days My Prince” and “Under The Queen's Umbrella”; I. Miscellaneous notes: Ep. 11: the fight with fans as weapons; “jangot” or head covering for noblewomen during the Joseon Dynasty ; the beautiful bridge across the pond in Ep. 1 and other episodes
​
Introduction
​
K-dramas are meant first (or primarily) for Korean viewers and only second for international viewers. Just like in other dramas, the historical, cultural, and political references in “Mr. Queen” are well known to the Korean viewers. On the other hand, we, the international viewers, must dig deep into Wikipedia and other sources (or post questions in forums like this) so that we can understand what’s going on.
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For example, some people who have seen “Mr. Queen” said that they couldn’t stand the court politics or the infighting between the different factions because the drama didn’t provide any context. Well, the court politics and the infighting between the different factions happened between the Andong Kim and Poonyang Jo clans, which are well known to Korean viewers and thus, no context was necessary.
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When “Saimdang” was first broadcast in 2017, I joined the on-air discussions of the drama in the Soompi Forums. In that forum, whenever I had questions about the drama, I had two go-to persons: for questions about Korean language, culture, and history, I asked “gerrytan8063”; whenever I had questions about Chinese characters used in the drama, I asked “liddi.” I haven’t joined the Soompi discussions after I found reddit, and so I don’t know if “gerrytan8063” and “liddi” are still active there.
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Where can we turn to when we, as international viewers, have questions about Korean language, culture, and history as they relate to K-dramas? There’s Quora, of course; “bodashiri” in Tumblr has a form in his website where he/she says, “Ask me anything.” Also, since 2012, the “Annals of the Joseon Dynasty” is being translated in English, with the project supposed to be finished in 2034. Certain portions of the English translation are available online, as you can read in “Globalization of Korean history” from the official Korean government history website.
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Oh, maybe we can also use ChatGPT in learning about the historical, cultural, and language issues that we come across in K-dramas.
​
The very first K-drama that I watched in full was the 2014 blockbuster “My Love From The Star” starring Jun Ji-hyun and Kim Soo-hyun. In this drama, I first heard the term “Joseon Dynasty” and learned how the dynasty heavily influenced what Korea is today.
​
Before “My Love From The Star” however, I had seen one or two brief scenes from the 2003 blockbuster drama “A Jewel in the Palace” (aka “Dae Jang Geum”) starring Lee Young-ae. Sometime in 2005 or 2006, “A Jewel in the Palace” began sweeping the Philippines. Every night at around 6 o’clock, the streets would become empty, with people shouting to each other as they rush to their homes, “Jang Geum na!” (in English, “It’s Jang Geum time!”). Since that time, “A Jewel in the Palace” has been broadcast in the Philippines five times; that’s how popular it is among Filipinos.
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I watched “A Jewel in the Palace” in its entirety only in 2015. Since then, I’ve seen each episode around four or five times already; whenever I feel depressed, I rewatch Ep. 6 where Jang Geum was exiled to the herb garden outside the palace. Needless to say, Lee Young-ae is the love of my life. Next to Lee Young-ae, I love Han Hyo-joo (“Dong Yi”), Han Hye-jin (“Jumong”), Han Ga-in (“The Moon That Embraces The Sun”), Moon Chae-won (“The Princess’s Man”), Park Shin Hye (“The Royal Tailor”), Shin Se-kyung (“Six Flying Dragons”), Park Ha-sun (Queen In-hyun in “Dong Yi”), Nana (“Into The Ring”), and Go Ara (“The Joseon Magician”), in that order.
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A. The historical figures who were fictionalized in this drama; lawsuit filed by descendants of a historical figure against “The Princess’s Man” (Soompi); the rivalry between the Andong Kim and Poonyang Jo clans and “sedo politics” (royal in-law politics)
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The main characters in “Mr. Queen” are So-yong (Queen Cheorin), played by Shin Hye-sun, and King Cheoljong, played by Kim Jung-hyun. Some of the secondary characters are Queen Sunwon (Grand Queen Dowager) of the Andong Kim clan and Queen Shinjeong (Queen Dowager) of the Poongyang Jo clan.
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“Mr. Queen” is fictional, with the following genres: historical, comedy, time travel, and body swap. But its characters and background events are inspired by historical figures and events. For example, the lead character (King Cheoljong) and his background facts — growing up destitute on Ganghwa Island, puppet of the Andong Kim clan, relatives persecuted as Catholics, etc. — are all based on history. Also, the conflict between the Andong Kim clan and Poonyang Jo clan is historical.
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King Cheoljong in “Mr. Queen” is a highly fictionalized character that’s different from the historical King Cheoljong. The drama portrays him to be secretly plotting to establish himself as a strong ruler against two warring political factions — the Andong Kim clan (led by Grand Dowager Queen Sunwon) and the Pungyang Jo clan (led by Dowager Queen Sinjeong).
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A-1. Historical figures who were fictionalized in “Mr. Queen”:
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(1) King Cheoljong
​

The 25th king of the Joseon Dynasty of Korea (25 July 1831 – 16 January 1864), he was a second cousin to the heirless Heonjong of Joseon, as well as a great-great grandson of Yeongjo of Joseon. He was chosen to become King by Senior Dowager Queen Sunwon (King Sunjo’s widow) and the powerful Andong Kim clan because he was illiterate and thus easy to manipulate.
Cheoljong ascended to the throne in 1849 at the age of 19 after King Heonjong died without an heir. As a distant relative of both the recently deceased king as well as a descendant of King Yeongjo, Cheoljong was selected for adoption by the Senior Dowager Queen Sunwon (King Sunjo’s widow) at the time and to allow him to ascend to the throne. The future Cheoljong was found on Ganghwa Island where his family had been in exile since the Catholic Persecution of 1801.
When the envoys (dispatched in order to seek for the future king) arrived on Ganghwa Island, they found the exiled remnants of the royal clan barely surviving in wretched poverty, and in the midst of that degradation, 19-year old Yi Won-beom was proclaimed King. Though from the start of the Joseon Dynasty Korean kings had given top priority to the education of their sons, Cheoljong could not even read a single word on the notice delivering congratulations to him on his elevation to the royal throne.
As part of the Andong Kim’s manipulation of Cheoljong, in 1851, the clan married Cheoljong to Kim Mun-geun’s daughter, known posthumously as Queen Cheor’in.
Cheoljong died at the age of 32 in 16 January 1864 (by suspected foul play by the Andong Kim clan, the same clan which made him king), without any surviving male heirs. Once again, it became necessary to search far back in the Yi lineage to find a candidate for the throne.

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The only surviving [cropped] image of King Cheoljong
(2) Queen Cheorin: wife of King Cheoljong, also known as Queen Dowager Myeongsun (27 April 1837 – 12 June 1878).
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Queen Cheorin belonged to the Andong Kim clan.
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(3) Grand Dowager Queen: Queen Sunwon (8 June 1789 – 21 September 1857), also known as Queen Dowager Myeonggyeong, was the spouse of Sunjo of Joseon. She served as regent of Korea from 1834–1841 and from 1849–1852.
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(4) Queen Dowager: Queen Shinjeong, also known as Queen Dowager Hyoyu, (21 January 1809 - 4 June 1890) was the only wife of Crown Prince Hyomyeong of Joseon and mother of King Heonjong of Joseon.
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Queen Shinjeong belonged to the Poonyang Jo clan.
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A-2. “Mr. Queen” was criticized for distorting history. Among the things that was criticized is the drama’s portrayal of the Queen Dowager (Queen Shinjeong in history) as being heavily involved in shamanism.
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From “Descendants of Sin Sook-joo sue The Princess’ Man” (Soompi): “According to the Seoul District Court, 108 descendants of old Sin claimed a damage suit of KRW 3 billion [2.2 million US dollars] against the broadcasting company and the writer for negatively distorting the image of their ancestor Sin Sook-joo from the Chosun era.”
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This lawsuit was filed in 2011; I couldn’t find any information about what happened to this lawsuit.
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A-3: Andong Kim clan, Poongyang Jo clan, and “sedo politics” (royal in-law politics)
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From New World Encyclopedia:
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At the beginning of the 19th century, the Andong Kim clan, who had provided the Joseon state with several queens, had seized power almost everywhere in Korea. The social stagnation that resulted was a breeding ground for unrest. Corruption and embezzlement from the treasury and its inevitable exploitation were taken to extreme levels, and reached staggering proportions. One rebellion after another was accompanied by natural disasters.
The only aim of the Andong Kim clan was the preservation of their influence. Their fierce campaign to dominate the royal house had led to a situation in which almost all of the representatives of the royal family fled from Seoul. When the royal family produced intelligent and appropriate candidates for the accession, they were either accused of treason and executed or sent into exile, so when Heonjong died, leaving no son, no acceptable candidate could be found to succeed to the throne.

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From “Exactly how much power did the Andong Kim Clan have in the Joseon court? How did they attain such power?” (Quora, by Michael L. Best) :
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“How did the Andong Kim clan attain power? By intermarrying with the royal family, enthroning young and easy to control men as king, purging political rivals, and, very likely, killing off any king when they begin to threaten their power.”
“After Queen Jeongsun stepped down [in 1805 as regent of King Sunjo], Queen Sunwon’s father, Kim Jo-soon, began to make his move. Kim Jo-soon, who at that time was already of high rank within the royal court, began to purge all his political rivals to help secure the position of his family and political faction. At the same time corruption in the civil service examination increased, likely in the form of bribes to the Kim clan.”

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The term “sedo politics” (royal in-law politics) describes the period 1800 to 1863 when national politics in Joseon was exclusively led by a few powerful royal in-law families, most notably the Andong Kim and Poongyang Jo clans.
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From“Collusive Oligopolistic Politics: Sedo and the Political Structure of Early-Nineteenth-Century Choson Korea” by Tae Yeon Eom (2012 thesis, University of British Columbia):
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In contemporary Korean historiography, the reign periods of King Sunjo (r. 1800-1834), King Hŏnjong (r.1834-1849), and King Ch’ŏlchong (r. 1849-1863) are generally called “The Era of Sedo Politics” in Chosŏn Korea (1392-1910). In contemporary Korean historiography, the political theme of sedo predominated after the death of King Chŏngjo (r. 1776-1800), when national politics was exclusively led by a few powerful royal in-law families, most notably the Andong Kim and P’ungyang Cho clans, for sixty-three years. Obviously, those two major clans enjoyed extensive political authority and high social status in the nineteenth century.

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Notes:
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(1) Queen Shinjeong was portrayed by Chae Soo-bin in the 2016 hit “Moonlight Drawn By Clouds” aka “Love in The Moonlight." Queen Shinjeong’s husband Crown Prince Hyomyeong (King Munjo) was portrayed by Park Bo-gum.
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(2) In Season 2 , Ep. 4 of “Kingdom,” Crown Prince Lee Chang visited in Ganghwa Island his distant relative Prince Noseong, an impoverished member of the royal family. The drama portrays Prince Noseong as a lowly fisherman but who’s a well-read man. This character was probably based on King Cheoljong (1831-1864), the last puppet king of the Andong Kim clan. Unlike the drama, however, in history, King Cheoljong was illiterate, which made it easy for him to be controlled by the Andong Kim clan.
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“Kingdom” Season 2, Ep. 4
B. Eps. 8 and 10: References to the persecution of Catholics during the Joseon Dynasty
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B-1. In Ep. 8, at around the 43:00 mark, Bong-hwan (Queen Cheorin) remembers what he learned in history classes about King Cheoljeong; among other things, he remembers that King Cheoljong’s “grandmother and aunt got killed by getting baptized.”
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In Ep. 10, at around the 46:57 mark, the Royal Chef tells Queen Cheorin (Bong-hwan) that he lives alone because all of his family were killed in 1839. Queen Cheorin (Bong-hwan) then recalls that he was referring to the “Gihae Persecution.”
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B-2. Some of the well-known persecution of Catholics during the Joseon Dynasty were the Sinyu Persecution of 1801, the Gihae Persecution of 1839, the Byeongo Persecution of 1846, and the Byeongin Persecution of 1866.
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Relevant discussions:
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From “A Brief History of the Catholic Church in Korea” (WSJ) : “The Sinyu Persecution - In 1801, more than 300 people were killed as the ruling Joseon Dynasty, under newly ascended King Sunjo, staged a clampdown on the Catholic Church in Korea, ostensibly because the religion clashed with ideals of Neo-Confucianism and threatened the social hierarchical system. Yi Seung-hun was among those executed.”
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From “Korean Catholicism marked by volatile history“ (Korean JoongAng Daily) : “Catholic believers suffered numerous rounds of persecution - the Sinhae Persecution (1791), the Sinyu Persecution (1801) and the Byeongin Persecution (1866) to name just a few - with about 10,000 missionaries and believers killed over a century.”
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B-3. The only K-drama I’ve watched that depicted the persecution of Catholics during the Joseon Dynasty is “Yi San, A Wind in the Palace.” In Eps. 60-61, the brother of FL Sung Song-yeon and his fellow Catholics were blamed and arrested for an assassination attempt against King Jeongjo.
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C. Ep. 8: Korean seesaw (“neolttwigi”)
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In the early part of Ep. 8, Queen Cheorin and her attendant play on a “neolttwigi” (Korean seesaw).
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2nd photo from National Geographic by W. Robert Moore, circa 1931
From Folkency: “Neolttwigi (lit. jumping on a board) refers to seesawing, a traditional entertainment practiced mainly by women during the Lunar New Year season. A large rectangular board is supported in its middle by a round hay bundle and two players take turns pushing hard on their end of the board with their feet in order to make the other end spring up.”
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It is thought that Yangban women developed “neolttwigi” to see over the walls that surrounded their homes, as women in traditional Korea were rarely allowed out of their living compounds, except at night. (Wikipedia, citing Rodney P. Carlisle, Encyclopedia of Play in Today’s Society, Volume 1)
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D. Ep. 12: Surit-nal (Dano Festival); ceremonial robes and head gear of Joseon kings
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In Ep. 12, King Cheoljong presides over the Royal Banquet during the celebration of the Surit-nal (Dano Festival). His ceremonial robe is called “gujangbok,” while the head gear is called “myeonryugwan” (The Talking Cupboard) .
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The robe and head gear were worn by the King and the Crown Prince during special events; with the head gear, the more the number of strings, the higher the rank. The jade object that he’s holding is called the “hol” (or “okgyu” depending on the type of jade used to make it.
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E. Ep. 14: Ice was a valuable commodity during the Joseon Dynasty.
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In Ep. 14, the Grand Queen Dowager tells Queen Cheorin (Bong-hwan) that ice is a valuable commodity in Joseon.
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From “Summer on ice: How ice became an essential part of summer life in Korea” (Korea Herald):
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During the Joseon era (1392-1910), ice was a national asset under the control of the king, and accordingly, a luxury for noblemen.
Harvested from rivers and ponds in the winter, ice blocks were stored at facilities called “binggo.” They were used for ancestral rituals, for medical purposes and to keep food cool. Seoul districts Seobinggo and Dongbinggo have their origins in the history of ice storage.

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From “Keeping food cool, the ancient way” (Korea JoongAng Daily) : “Since the year 505, or the 6th year of King Jijung’s reign, until the arrival of freon and electricity centuries later, Koreans used stone bunkers to store blocks of ice throughout the year. These seokbinggo, literally “stone ice storage,” were located around the country. Local governments sometimes delivered ice to palaces, but mostly used ice as a means to prevent special local products from spoiling on the way to a palace.”
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From “Feeling the heat: The luxury of ice” in Joseon (Korea Times) by Robert Neff:
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The Korean government maintained two large ice storage facilities at Seobinggo and Dongbingo, where huge slabs of river ice (nearly two meters long and about 12.5 centimeters thick) were covered with straw and preserved throughout the year. Court officials and others who possessed “bingpae” ― an ice ration card ― were regularly able to obtain a certain amount of this valuable commodity (based on their rank) for their own use.
The common people, however, had to either purchase ice on the black market or from ice merchants. The black market ice ― obtained illegally from one of the government ice storage facilities ― was probably considered to be safer but much more difficult to obtain and so most people had to rely on local ice vendors.

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Notes:
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(1) “The Grand Heist” is a 2012 South Korean historical comedy film about a gang of 11 thieves who try to steal ice blocks from the royal storage, Seobingo, during the last years of the Joseon era.
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(2) In Ep. 9 of “A Jewel in the Palace,” crisis hits as Lady Han falls sick and Jang Geum, with Keum Young, is left to prepare the food for the king and his entourage in the royal hunt. When the Head Eunuch tells Jang Geum and Keum Young that the king wants cold noodles, he asks them if they brought ice with them. (When I first saw this scene back in 2015, I thought, “What’s the big deal with ice?”)
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(3) In Ep. 2 of “The Tale of Nokdu,” Yul Mu prepares for Dong Joo a dessert for breakfast. The gisaengs around him become awestruck after the package that his bodyguard brought turns out to be a small block of ice.
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What Yul Mu prepared for Dong Joo is similar to “patbingsu” (“bingsu).” Bingsu was introduced to Korea during the Japanese colonial period, but according to “Snowy delights and variations on bingsu” (Korea Herald) , shaved ice treats existed even during the Joseon Dynasty.
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https://i.redd.it/n78c477zy2pa1.gif
This is a bit off-topic, but notice two things after Yul Mu’s bodyguard finishes chopping the ice into smaller pieces:
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(a) Before sheathing his sword into the scabbard, the bodyguard makes a downward slash with his sword and with a quick wrist flick; he did this to get rid of the water that may create rust in his sword. A swordsman also does this after slashing an enemy; blood may also cause the sword to become rusty.
(b) The bodyguard sheaths his sword into the scabbard with the bladed side up. Why? Two reasons. One, if the bladed edge is sheathed with the bladed edge down, gravity will pull the blade down into the scabbard, causing the blade to become dull. Two, it seems that when a sword is sheathed with the blade up, it’s easier to unsheathe the sword and quickly attack an enemy.

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(4) In Ep. 7 of Mr. Sunshine, Ae-shin and her servant Haman enjoy “patbingsu” (“bingsu”) in the French bakery.
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F. Ep. 14: Donghak (religion, movement, peasant revolution)
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In Ep. 14, the ministers threaten King Cheoljeong that if he does not order the execution of Dam Hyang (the little girl who saved Queen Cheorin from being poisoned), they will consider him as a supporter of the “Donghak” religion and its followers.
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From Wikipedia:
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Donghak (lit. “Eastern Learning”) was an academic movement in Korean Neo-Confucianism founded in 1860 by Choe Je-u. The Donghak movement arose as a reaction to seohak (“Western learning”), and called for a return to the “Way of Heaven.” While Donghak originated as a reform movement and revival of Confucian teachings, it gradually evolved into a religion known today as “Cheondoism” in Korea under the third patriarch.
Choe was alarmed by the intrusion of Christianity (Catholicism), and the Anglo-French occupation of Beijing. He believed that the best way to counter foreign influence in Korea was to introduce democracy, establish human rights and create a paradise on Earth independent of foreign interference.
In 1892 the small groups of the Donghak movement were united into a single Peasant Guerrilla Army or Donghak Peasants’ Army. The peasants worked in the fields during the day, but during the night, they armed themselves and raided government offices and killed rich landlords, traders, and foreigners. They confiscated their victims’ properties for redistribution.
Choe Je-u was executed as a criminal by the government. The movement was continued by Choe Si-Hyeong (1829–1898), who systematized its doctrine. He too was executed.

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Related resources: “Gov’t to commemorate Donghak Peasant Revolution for 1st time” ; “Korea celebrates 125th anniversary of Donghak Peasant Revolution in 1894 (2020)”
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G. Ep. 16: Difference between “Jo” and “Jong” in the posthumous (temple) names of the Joseon kings; the Joseon kings’ royal portraits and dramas such as “Painter of the Wind” and “Saimdang”
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G-1. In Ep. 16, during the Royal Portrait painting session, Queen Cheorin wonders about the difference between between “Jo” and “Jong” in the posthumous (temple) names of the Joseon kings. The subtitles say that “jo” is added to the name of a king who’s honored for doing something great; on the other hand, “jong” is added to the name of a king who’s honored for his virtue. Well, this is just one of two reasons for the difference.
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The website “dramasROK” in its in-depth article cites Korean historian Sul Min Suk who gives two reasons for the difference:
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(1) Relationship of the king to his predecessor:
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“If the successor was the king’s son – or next in line to the throne – then that king was given a posthumous title ending in JONG.
“BUT if the king was not next in line to the throne and started a new line within the Yi dynasty then his posthumous name was JO.”

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(2) “The ending JO was given to the founder of the dynasty – Taejo – for great achievements establishing a new dynasty. And then his descendants were supposed to be named JONG. So in a way, the title JO could be considered superior to JONG. And from now on this was the case. JO was seen as a more elite title to JONG. It started with King Seonjo…”
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Relevant discussions: Why was King Sejong named "Sejong" instead of "Sejo"? and “Rulers of the Joseon Dynasty and KDrama Interpretations”
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G-2. The Joseon kings’ royal portraits and dramas such as “Painter of the Wind” and “Saimdang”
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Only seven portraits of five Joseon kings remain today as the others were destroyed during the Korean War (1950-1953). These surviving portraits are those of King Sejong, King Yeongjo, King Jeongjo, King Cheoljong, King Gojong, and King Sunjong. You can view these portraits at the Royal Portrait Museum in Jeonju, Korea.
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https://preview.redd.it/0nxhjw1ez2pa1.jpg?width=450&format=pjpg&auto=webp&s=51dd5a7e7da44d8ca156664e85c355c1b13dbc6c
For a more detailed depiction of how the Joseon kings’ royal portraits were drawn according to strict standards, you can watch “Painter of the Wind” (2008; Eps. 10-11) and “Saimdang” (2017; Ep. 22).
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H. Ep. 16: Secret Royal Investigators during the Joseon Dynasty; secret royal investigators as depicted in “100 Days My Prince” and “Under The Queen's Umbrella”
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H-1. In Ep. 16, King Cheoljong sends his trusted man Hong as a secret royal investigator to the most corrupt place in south Joseon. In his confrontation with a nobleman in a gisaeng house, Hong displays his “mapae.”
From “Amhaeng-eosa - secret royal inspector in Joseon Kingdom”:
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“They were undercover officials directly appointed by the king and were sent to local provinces to punish corrupt officials and comfort the sufferings of people while traveling incognito. The amhaeng-eosa system was one of the most excellent inspection systems in the world, the likes of which is very unique and hard to find in other countries.”
The “mapae” was the badge of the secret royal inspectors, and the number of horses carved on it indicated the number of horses that they could requisition from the royal stables (“saboksi”) in pursuit of their assignment. The secret royal inspectors also used the “mapae” to summon soldiers.

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The book “Corea, The Hermit Kingdom” (1888) by William Elliott Griffis states several interesting things about the secret royal inspectors. They were called “The Messengers on the Dark Path,” and to prevent them from abusing their powers, they were secretly monitored by a “yashi” or “Night Messenger.” Griffis states:
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“An E-sa, or commissioner, who is to be sent to a distant province to ascertain the popular feeling, or to report the conduct of certain officers, is also called ‘The Messenger on the Dark Path.’ He receives sealed orders from the king, which he must not open till beyond the city walls. Then, without even going to his own house, he must set out for his destination, the government providing his expenses. He bears the seal of his commission, a silver plate having the figure of a horse engraved on it. In some cases he has the power of life and death in his hands.
“Yet, even the Messenger of the Dark Path is not free from espionage, for after him forthwith follows his ‘double’ the yashi or Night Messenger, who reports on the conduct of the royal inspector and also on the affairs of each province through which he passes. The whereabouts of these emissaries are rarely discoverable by the people, as they travel in strict disguise, and unknown.
“This system corresponds almost exactly to that of the ometsuke (eye-appliers), for many centuries in use in Japan, but abolished by the Mikado’s government at the revolution of 1868. It was by means of these E-sa or spies that many of the Corean Christians of rank were marked for destruction. The system, though abominable in free countries, is yet an excellent medium between the throne and the subject, and serves as a wholesome check on official rapine and cruelty.”

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H-2. Secret royal inspectors as depicted in "100 Days My Prince" and "Under the Queen’s Umbrella":
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In Ep. 7 of “100 Days My Prince,” a royal secret inspector (“Amhaengeosa”) saves Yul and Hong-shim from the corrupt magistrate and Master Park. Hong-shim previously recognized that the man sleeping in her father’s room was a royal secret inspector because he was holding a “yuchuk” (a brazen ruler that inspectors used for several purposes, including making sure that the measurement system for taxation was correctly followed).
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https://preview.redd.it/fp2wmm7kz2pa1.jpg?width=450&format=pjpg&auto=webp&s=dbb8423675f5ae42963be7a4c1843021afde71bb
In Eps. 8-10 of “Under The Queen's Umbrella, as part of the contest, the Grand Princes and the princes disguise themselves as “secret royal inspectors” (“amhaeng-eosa”) in pursuit of the assignments given by King Lee Ho. In some scenes, you can see the inspectors’ seal (badge) and tool: the “mapae” and the “yuchuk.”
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I. Miscellaneous notes: Ep. 11: the fight with fans as weapons; “jangot” or head covering for noblewomen during the Joseon Dynasty ; the beautiful bridge across the pond in Ep. 1 and other episodes
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I-1. Ep. 11: During the festival, King Cheoljoeong and Kim Byeong-in fight using fans as requested by the Grand Queen Dowager. While they’re using ordinary fans, there’s actually a martial art system using a fan as a weapon.
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https://preview.redd.it/xifgh51b23pa1.jpg?width=450&format=pjpg&auto=webp&s=58765eca5345effd9c2f3bbc9d82699a523d54f2
From Wikipedia: Tessenjutsu (Japanese; lit. “iron fan technique”) is the martial art of the Japanese war fan (tessen). It is based on the use of the solid iron fan or the folding iron fan, which usually had eight or ten wood or iron ribs. The use of the war fan in combat is mentioned in early Japanese legends.
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In Ep. 11 of “Saimdang,”Lee Gyeom fights off Min Chi-hyung’s men using his fan.
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Related resources: War Fan Tessen Techniques and Why Samurai Carried and Fought with Fans Made of Metal
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I-2. “Jangot” (alternative spelling ”changot”): similar to the outer jacket of a hanbok but with a collar and a ribbon for tying both sides; according to the principles of the Joseon Dynasty’s Confucianism, women were ordered not to show their face to men, so they would cover their faces in many ways while going out. (Wikipedia)
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https://preview.redd.it/r06c2mioz2pa1.jpg?width=450&format=pjpg&auto=webp&s=975e4ba5fdaafc0a05a793fdc61010abc336fdbd
From “Veiling of Korean Women: The Neo-Confucian Influence in Comparison to the Veiling of Muslim Women” by Hye Ok Park (Claremont Graduate University, Department of History) :
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Different types of veils
“There were several different types of veils, Sseugae, worn by Korean upper-class women: Nuhwool, a black sheer silk framed veil to cover from head to waist (Figure 3), Jangot, a head and face-covering in the shape of overcoat, usually made of green pure silk with purple collar and chest straps to be tied at the chin (Figure 4), and Sseugae chima or shorter Jangot, worn by the lower-ranking upper-class women (Figure 5).
“Lower-class common women were not subjected, or allowed, to wear any headdresses except for the purpose of protection from weather, hot or cold, in which case they wore a simple square piece of cloth, called cheoneui, folded in half diagonally and tied in the back of the head. It was common that they did not wear anything to cover their heads or faces when they went out on their own or accompanying a noble woman as seen in Figure 1 above.”

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I-3. The beautiful bridge and pond shown below are used as the location for several scenes in “Mr. Queen”, starting with Ep. 1. This bridge is located in the Gungnamji Pond (Historic Site No. 135) in Seodong Park; it is Korea’s first artificial pond and was created by King Mu from the Baekje Dynasty. The bridge and pond have been used in other dramas such as “The Flower in Prison,” “The Joseon Gunman,” and “The Tale of Nokdu.”
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https://preview.redd.it/mloxzq7tz2pa1.jpg?width=450&format=pjpg&auto=webp&s=5e015dccd9623cffb9b1abe21f33158f999ff054
Notes:
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(1) In digging up the historical and cultural backgrounders of the K-dramas that I watch, I rely on English language resources on the Internet. I don’t speak or read Korean, and so I can’t search through Naver. Those of you who read Korean or are more knowledgeable about Korean culture and history should correct whatever errors or omissions there may be in this discussion.
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(2) Other discussions that I have posted on the historical and cultural backgrounders of K-historical dramas:
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“Hotel Del Luna” (some cultural backgrounders for international viewers)
“The Princess’s Man” (award-winning 2011 drama starring Moon Chae-won and Park Si-hoo)
“The Flower in Prison” (blockbuster 2016 drama starring Jin Se-yeon and Go-soo; 34 of its 51 episodes reached more than 20% viewership)
“Jejoongwon” (2010 historical-medical drama starring Han Hye-jin, Yeon Jung-hoon, and Park Yong-woo; Dramabeans ranked this drama as number one in its review of 2010 dramas)
“Chinilpa” (mini history lesson from "Chicago Typewriter")
Historical paintings depicted in "Saimdang, Light’s Diary"
Historical backgrounders for “The Red Sleeve” (2021) and “Yi San” (2007) with parallels and differences between these dramas

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(3) This discussion is rather long and may be a bit boring for those of you who don't like history. If you got tired reading this discussion, you can energize yourself by listening to Band-Maid’s performances during their 2022 USA tour. Band-Maid is an all-female Japanese band that mixes genres such as rock (hard, progressive, punk), metal, pop, jazz, and blues. Listen for example to “Freedom" (anthem; watch out for the drum solo); “Daydreaming" (power ballad; watch out for the lead guitar solo); “Wonderland” (rock-jazz-blues).