The benchmark Korea Composite Stock Price Index plummeted 274-point-69 points, or five-point-26 percent, on Monday to close at four-thousand-949-point-67.

The tech-heavy KOSDAQ lost 51-point-08 points, or four-point-44 percent, to close at one-thousand-98-point-36.

The South Korean won weakened against the U.S. dollar by 24-point-eight won, trading at one-thousand-464-point-three won as of 3:30 p.m.