Thailand, South Korea shares plunge, triggering circuit breaker — what investors need to know

South Korea and Thailand​ stock market crash: Asian markets witnessed a brutal trading week as escalating Middle East tensions sent Thailand's SET Index plunging 8% and South Korea's KOSPI tumbling 12.06%, its worst drop since 1980. Both markets saw trading halts due to circuit breakers. Oil dependency fears and AI trade unwinding fueled the sharp selloffs, wiping out billions in value.