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
As of 2018, most stores in North Korea take U.S. dollars, euros and Chinese yuan/renminbi. Since more renminbi and U.S. dollars are brought into the country than euros, change from transactions is primarily returned in renminbi or U.S. dollars.