According to Jin10, Japanese and South Korean stocks opened lower as a global selloff in chip stocks continued and investors grew more cautious about the sustainability of the AI investment boom and the earnings outlook for related companies. The Nikkei 225 fell more than 3% intraday, Kioxia dropped more than 8%, and South Korea's KOSPI fell for a seventh straight session, at one point sliding 6% to its lowest level since July 31. Semiconductor heavyweight stocks were the main drag, with Samsung Electronics down more than 7% and SK Hynix down more than 8%. The Korea Exchange later activated a sidecar mechanism on the KOSPI, suspending programmatic sell orders.