Korean currency
In 1902, won was introduced as the official currency unit replacing yang at 1 won = 5 yang. The bank of Korea was established 1909 but soon after in 1910, Imperial Japan annexed Korean Empire. Under Colonial rule, the country was made to use the currency unit "yen" in the name of Korean yen, which took over the Korean won at par. After the division of Korea, the state of South Korea was established and recognized in 1948, and won was again made the official currency of the new state. "jeon" was made the subunit of the currency that divided it into 100 equal parts. Bank of Joseon issued the currency for independent South Korea for the first time that too in banknotes only.
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.