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.
North Korean won
In 1979, the currency was again reformed, and a new banknote series was issued in denominations of 1, 5, 10, 50, and 100 won. There is ongoing speculation as to why this move was made. All 1959 banknotes were removed from circulation. Circulating coins, however, were not affected by this change. The designs for this issue were much more symbolic and charismatic than previous ones, with Kim Il-sung featuring for the first time on the 100 won note.