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The won was quoted at 1,016.2 per dollar at the end of onshore trade, up 0.5 percent from Wednesday's 1,021.0 and the biggest daily percentage rise since a 0.8 percent gain on May 7. Won buying by South Korean exporters in order to meet end of month settlements added to the currency's strength.
The Korea Composite Stock Price Index (KOSPI) closed up 0.7 percent at 1,995.05 points, the highest close since June 17 and bounced back from the Wednesday's 0.6 percent decline.
Kia Motors Corp rose 2.6 percent on expectations that the South Korean automaker may build its first factory in Mexico.