Even after a recent bounce, the South Korea Kospi index is off 25.9% from its June 22 record close, weighed down by SK Hynix and Samsung.

Even after a recent bounce, the South Korea Kospi index is off 25.9% from its June 22 record close, weighed down by SK Hynix and Samsung.

South Korea's Kospi index has plunged over 9% on heavy selling of chipmaking stocks that have gyrated recently due to concerns over the sustainability of the boom in artificial…