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On Oct. 30, the KOSPI fell 3.48% (206.92 points) to close at 5,730.74, driven by U.S. tech losses and concerns over AI investment returns, with foreign investors net-selling 1.8 trillion won. Samsung Electronics dropped 3% and SK hynix 7%, triggering a sell-side circuit breaker. Yonhap reports the tech-heavy KOSDAQ also lost 28.85 points, or over 3%. The sell-off followed Alphabet's weak earnings, which fueled an 'AI bubble' debate, as Business Korea notes added pressure from Fed tightening worries.