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The won was quoted at 1,107.8 to the dollar at the end of onshore trade, compared to Monday's close of 1,117.7.
South Korean shares fell, as a deep plunge in oil prices rocked energy counters and local shipyards specializing in the construction of drillships and offshore oil and gas platforms.
The Korea Composite Stock Price Index (KOSPI) fell 0.4 percent to close at 1,970.95 points.