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.
Room 39
Room 39 (officially Central Committee Bureau 39 of the Workers' Party of Korea, also referred to as Bureau 39, Division 39, or Office 39) is a secretive North Korean party organization that seeks ways to maintain the foreign currency slush fund for the country's leaders, initially Kim Il-sung, then, in progression, Kim Jong-il and Kim Jong-un.