Korean currency
The yen was the currency of Korea during the Colonial rule, from 1910 to 1945, and was issued by the Bank of Joseon It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. It was replaced by the South Korean won at par in 1945, and by the North Korean won in 1947.
South Korean won
The old "won" was a cognate of the Chinese yuan and Japanese yen. It is derived from the hanja (), meaning "currency" or "coin." The won was subdivided into 100 "jeon" (), itself a cognate of the Chinese character 錢 ("qián") which means "money" and also used as a unit of money in ancient times. The current won (1962 to present) is written in hangul only and does not officially have any hanja associated with it.