South Korea's KOSPI crashed nearly 10% on June 23 after Broadcom's Q3 AI chip guidance of $16 billion missed Wall Street's $17.2 billion estimate, triggering a circuit breaker as Samsung and SK Hynix each fell more than 12%. The selloff exposed the KOSPI's dangerous concentration in two memory chip stocks and the fragility of a market priced for perpetual perfection in AI hardware demand.