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.
Korean won
The won was introduced in 1902, replacing the yang at a rate of 1 won = 5 yang. Units: 1 won = 100 chon/銭, 1 chon = 5 poon/分(fun ec. yesteryear spellings) of the preceding currency. In 1909, the Bank of Korea (한국은행; 韓國銀行) was founded in Seoul as a central bank and began issuing currency of a modern type. The won was equivalent to the Japanese yen and was replaced by the Korean yen in 1910 during the Colonial Era. In 1910, the Bank of Korea was renamed the Bank of Joseon (; 朝鮮銀行), which issued notes denominated in yen and "sen".