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.
O Kuk-ryol
In June 2009, O was identified by international authorities and the United States government as a key figure in North Korea's currency counterfeiting activities, specifically with United States one hundred-dollar bills, known as Superdollars. He was reported to have also involved members of his family, including his son O Se-won, in the counterfeiting business, which reportedly took place at the Pyongsong Trademark Printing Factory, a factory under the control of O's Operations Department. His other son O Se-uk, who was also a military general, defected to the United States in 2004. He also has five daughters, the eldest of which is a screenwriter for a film studio. O is also reportedly fluent in Russian, Chinese, and English. In 2006, a South Korean intelligence report noted he was perceived as reliable and knew South Korea well.