A quarter past the opening at 9:00 a.m. in Seoul, the KOSPI gained 7.78 percent to 8,373.11, more than eclipsing the previous 4.5 percent fall and extending this week's bout of violent swings from 4 to 8 percent.
Samsung Electronics rose 10.0 percent to 329,000 won ($217) and SK hynix gained 8.9 percent to 2,287,000 won ($1,507) as foreigners returned in force.
The advance was broad, with 797 stocks rising against just 63 decliners. The junior KOSDAQ added 3.3 percent to 1,029.4, and the KOSPI 200 climbed 7.6 percent. The dollar strengthened from overnight to 1,521.50 won.
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