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The won rose as much as 0.3 percent to 1,016.7 per dollar in local trade, its strongest since Aug. 19, on demand from exporters for month-end settlements.
Offshore funds also bought the won, while the South Korean unit hovered near a six-year high against the yen.
China's yuan rose as investors stayed bullish on the currency and corporate demand helped offset a weaker daily midpoint fixing by the central bank.