The benchmark Korea Composite Stock Price Index rose 2.73 points, or 0.11 percent, to 2,460.89 as of 11:20 a.m.
Top cap Samsung Electronics fell 0.84 percent, and global chipmaker SK hynix declined 1.01 percent.
No. 1 automaker Hyundai Motor fell 1.29 percent, and its smaller affiliate Kia Motors traded 2.3 percent lower.
POSCO, the No. 1 steelmaker, fell 0.95 percent.
Naver, the operator of the country's top Internet portal, rose 2.26 percent.
The local currency was trading at 1,135.45 won against the US dollar, down 0.25 won from the previous session's close. (Yonhap)