Korean currency
The yen was the currency of Korea during the Colonial rule, from 1910 to 1945, and was issued by the Bank of Joseon It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. It was replaced by the South Korean won at par in 1945, and by the North Korean won in 1947.
Economy of North Korea
North Korea had a similar GDP per capita to its neighbor South Korea from the aftermath of the Korean War until the mid-1970s, but had a GDP per capita of less than $2,000 in the late 1990s and early 21st century.