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The won was quoted at 1,086.7 to the dollar at the conclusion of onshore trade, compared to Monday's close of 1,099.1.
South Korean shares fell, closing just barely above a 2-month low as a relentless plunge in oil prices underscored sluggish growth and deflation risks faced by the global economy.
The Korea Composite Stock Price Index (KOSPI) fell 0.9 percent to close at 1,904.13 points.