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.
Beer in North Korea
Tourists may buy beer with foreign currency without the limitations that apply to North Koreans. Beer in international hotels cost about two euros. Indeed, for tourists, according to Josh Thomas, the actual "price of drinking North Korean beer is bowing to a lot of statues of Kim Il-Sung and Kim Jong-Il, listening to their version of the Korean war, and eating anything and everything they give you to eat".