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
Due to the short notice of the change in currency, the first series of the new notes was commissioned from the United States Government Printing Office. The notes were released in five denominations, all with an identical design. Some replacement notes with a more suited Korean theme were later issued, starting with the 100 hwan just a month later.