The benchmark Korea Composite Stock Price Index rose 1.98 points, or 0.08 percent, to 2,476.74 in the first 15 minutes of trading.
Most large caps had mixed trading, with market kingpin Samsung Electronics falling 1.72 percent.
Top automaker Hyundai Motor declined 0.96 percent, while top steelmaker POSCO rose 1.6 percent.
The local currency was trading at 1,133.40 won against the US dollar, down 0.2 won from the previous session's close. (Yonhap)