The won was quoted at 1,172.6 to the dollar at the conclusion of onshore trade, down 0.6 percent compared to Monday's close of 1,165.8.
South Korean shares finished higher as China's consumer inflation came in at 2.3 percent in April, staying level for a third month in a row, relieving some worries about the world's second largest economy's health.
The Korea Composite Stock Price Index (KOSPI) closed up 0.8 percent at 1,982.50 point.