The benchmark Korea Composite Stock Price Index tumbled 207-point-53 points, or three-point-86 percent, on Thursday to close at five-thousand-163-point-57.

The tech-heavy KOSDAQ lost 41-point-02 points, or three-point-57 percent, to close at one-thousand-108-point-41.

The South Korean won weakened against the U.S. dollar by 18-point-eight won, trading at one-thousand-469 won as of 3:30 p.m.