On July 28, influenced by concerns over Nvidia's significant AI supply agreements and intensified market competition, investor sentiment was dampened, leading to a sharp decline in the Japanese and Korean stock markets. The Nikkei 225 index fell by as much as 4%, reaching its lowest level since May 22; the Tokyo Stock Exchange index saw a maximum drop of 2.7%. The South Korean KOSPI index plummeted by 7.6%, marking a new low since April 20. Semiconductor and equipment stocks, including Tokyo Electron, Kioxia, Samsung Electronics, and SK Hynix, led the decline, each dropping over 9%. Notably, SK Hynix's stock price plummeted by 30% at one point, marking the largest single-day drop in its history; Kioxia's stock fell by 18%, the largest drop since November of last year. Amid a wave of AI-related transactions valued at over $750 billion, the cost of Nvidia's debt default insurance surged, triggering a decline in tech stocks. Hideyuki Ishiguro, Chief Strategist at Nomura Asset Management, noted that following reports of significant investment deals involving Nvidia, its credit risk has increased, which investors view as a negative signal. Furthermore, Ishiguro pointed out that advancements in semiconductor manufacturing equipment in China pose a threat to Japanese suppliers, who have long held a competitive advantage in this field.