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
In 1979, the currency was again reformed, and a new banknote series was issued in denominations of 1, 5, 10, 50, and 100 won. There is ongoing speculation as to why this move was made. All 1959 banknotes were removed from circulation. Circulating coins, however, were not affected by this change. The designs for this issue were much more symbolic and charismatic than previous ones, with Kim Il-sung featuring for the first time on the 100 won note.