The benchmark Korea Composite Stock Price Index tumbled 61-point-nine points, or one-point-53 percent, on Thursday to close at three-thousand-994-point-51.

The tech-heavy KOSDAQ edged down nine-point-74 points, or one-point-07 percent, to close at 901-point-33.

The South Korean won strengthened against the U.S. dollar by one-point-five won, trading at one-thousand-478-point-three won as of 3:30 p.m.