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.
North Korean won
Initially struck in 2002, the coins were intended for use shortly after the dollar peg was removed from the currency. The 50 chon and 1 won were smaller than the previous designs, while the new 10 chon was the same size as the old. Hyperinflation became a very sudden reality, however, and the new coins were never released as planned. In 2008, 1 and 5 chon coins were also struck when a plan for monetary revaluation began. The coins were finally released into circulation in December 2009 but due to the flawed nature of the revaluation these coins again carry very little value, with especially the 1 and 5 chon being virtually irrelevant.