Foreign investors returned to net buying in the KOSPI market on Friday for the first time in 25 trading days, fueling a sharp rally that briefly se...

KOSPI surged 8.2% to 8,096.93 as Korean retail investors bought the dip while foreigners sold $3.7B. Record margin debt of $39B raises deleveraging risks.

The recent increase in stock market volatility is raising fears that retail investors who used borrowed funds to buy stocks could face heavy losses...