South Korean stocks lost ground Wednesday ahead of the conclusion of the U.S. Federal Reserve's policy-setting meeting. The local currency fell against the U.S. dollar. The benchmark Korea Composite Stock Price Index (KOSPI) started off in positive territory and dropped throughout a choppy session before ending the day at 1,937.68, dipping 0.13 percent, or 2.53 points, from Tuesday's close. The downturn came after the main bourse rose for two straight sessions.