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.
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.