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The won was quoted at 1,165.9 to the dollar at the conclusion of onshore trade, down 0.64 percent versus Thursday's close of 1,158.5.
The Korea Composite Stock Price Index (KOSPI) closed down 0.31 percent at 2,024.69 points, pulling back from more than a 6-week high a day earlier.
Parliament is expected to vote in favour of impeaching Park over an influence peddling scandal, but the Constitutional Court must uphold the motion for her to be removed from office, a process that could take up to 180 days.