On October 15, stock markets in Japan and South Korea witnessed substantial downturns, driven by mounting concerns over the investment risks associated with artificial intelligence. On that day, the Nikkei Index of the Tokyo Stock Exchange in Japan concluded trading at 64,425.95 points, plummeting by 3,318.34 points, or 4.90%, compared to the previous trading session. This marked the steepest one-day decline since March of this year. Prior to this, the three major stock indices on the New York Stock Exchange in the United States had already experienced a broad-based fall. Data revealed that the rise in the US consumer price index in September surpassed market forecasts, fueling heightened expectations of a Federal Reserve interest rate increase. Consequently, investor risk appetite diminished, prompting a sell-off of stocks linked to artificial intelligence and semiconductors. Consequently, share prices of Japanese semiconductor equipment firms, such as Advantest and Tokyo Electron, tumbled, exerting downward pressure on the Nikkei stock index.