https://en.wikipedia.org/wiki/Battle_of_Chosin_Reservoir
North Koreans use Chosŏn[19], Namjosŏn (남조선, 南朝鮮; "South Chosŏn"), and Bukchosŏn (북조선, 北朝鮮; "North Chosŏn") when referring to Korea, South Korea, and North Korea, respectively. The term Bukchosŏn, however, is rarely used in the north, although it may be found in pre-war sources, such as the Song of General Kim Il-sung.
An early attempt to translate these characters into English gave rise to the expression "The Land of the Morning Calm" for Korea, which parallels the expression "The Land of the Rising Sun" for Japan. While the wording is fanciful, the essence of the translation is valid.[citation needed]
https://en.wikipedia.org/wiki/Names_of_Korea#cite_note-19
Chosun in English
The Kingdom of Joseon (, literally "Great Joseon State"; also Choson, Choson, Chosun) was a Korean kingdom founded by Yi Seonggye that lasted for approximately five centuries, from July 1392 to October 1897. It was officially renamed the Korean Empire in October 1897. It was founded following the aftermath of the overthrow of Goryeo in what is today the city of Kaesong. Early on, Korea was retitled and the capital was relocated to modern-day Seoul. The kingdom's northernmost borders were expanded to the natural boundaries at the Yalu and Tumen Rivers through the subjugation of the Jurchens. Joseon was the last dynasty of Korea and its longest-ruling Confucian dynasty.
https://translation.babylon-software.com/english/Chosun/
interesting, anon. i think you have something there.