Korean yen
The Korean yen was the currency of Korea between 1910 and 1945. It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. The yen was subdivided into 100 sen. It replaced the Korean won at par and was replaced by the South Korean won and the North Korean won at par.
Korean mun
The mun was introduced as the main currency of Korea in 1633 and stayed in use until 1892. It resembled and was derived from the Chinese wen (cognate also to the Japanese mon, Ryukyuan mon, and the Vietnamese văn). Coins denominated in mun were cast in copper or bronze and were round with square holes. From the 17th century until the end of the 19th century, coins denominated in "mun" bearing the inscription "Sangpyeong Tongbo" (, ) were the most widely circulated currency. In 1888, coins were struck in small numbers denominated in mun and won (equal to 1000 mun). The mun was replaced in 1892 when the yang was introduced.