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 currency
Korean currency dates back as far as the Goryeo dynasty (918–1392) when the first iron coins were minted. During that period, even though some imported Chinese currency was also in circulation, commodity currency such as grain and linen continued in general circulation.