Following an 80 per cent plunge in a popular SK Hynix leveraged fund, authorities have moved to overhaul rules for some high-risk investments.

SK hynix and Samsung lost around 13 percent, dragging the Kospi index down 10.2 percent, having earlier been paused for a 20-minute circuit-breaker.

HONG KONG - The Kospi in South Korea plunged 10% as tech shares took a battering on another black day for Asian stock markets, with a report of a breakthrough in China’s chip…