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
After the division of Korea, North Korea continued using the Korean yen for 2 years until the Central Bank of the Democratic People's Republic of Korea was established on December 6, 1947 and a new currency was issued. It was at the time pegged at par to the Soviet ruble. It was revalued at a rate of one hundred to one in February 1959 and new won were issued.