Other bluechips also traded lower across the board, with market kingpin Samsung Electronics declining 0.46 percent. SK hynix, a major chipmaker, was down 0.71 percent.
No. 1 carmaker Hyundai Motor dropped 0.85 percent, and LG Chem, a leading chemicals firm, surrendered 0.74 percent.
Top steelmaker POSCO backtracked 0.19 percent.
The South Korean currency was trading at 1,135.00 won against the U.S. dollar, down 6.6 won from the previous session's close.