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 won
The won was introduced in 1902, replacing the yang at a rate of 1 won = 5 yang. Units: 1 won = 100 chon/銭, 1 chon = 5 poon/分(fun ec. yesteryear spellings) of the preceding currency. In 1909, the Bank of Korea (한국은행; 韓國銀行) was founded in Seoul as a central bank and began issuing currency of a modern type. The won was equivalent to the Japanese yen and was replaced by the Korean yen in 1910 during the Colonial Era. In 1910, the Bank of Korea was renamed the Bank of Joseon (; 朝鮮銀行), which issued notes denominated in yen and "sen".