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
In 2009, another currency reform was initiated to tackle hyperinflation and black market activities. Unlike previous reforms, the 2009 move sparked a nationwide panic when it was announced there would be a two-week waiting period between the withdrawal of the old currency and the introduction of the new currency, coupled with an exchange limit of only 500,000 old won for each person, effectively wiping out savings. The state eventually pulled back on most exchange limits; however, the revaluation proved to be a failure.