Korean currency
In 1902, won was introduced as the official currency unit replacing yang at 1 won = 5 yang. The bank of Korea was established 1909 but soon after in 1910, Imperial Japan annexed Korean Empire. Under Colonial rule, the country was made to use the currency unit "yen" in the name of Korean yen, which took over the Korean won at par. After the division of Korea, the state of South Korea was established and recognized in 1948, and won was again made the official currency of the new state. "jeon" was made the subunit of the currency that divided it into 100 equal parts. Bank of Joseon issued the currency for independent South Korea for the first time that too in banknotes only.
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.