Etymology of the Korean currencies
The won is the currency of both North and South Korea. "Won" is a cognate of the Chinese currency unit, the yuan (//), and the Japanese currency unit, the yen (; ¥), meaning "round object". The won is subdivided into 100 jeon ().
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.