Samsung Electronics announced its highest-ever performance on the 7th, but KOSPI plunged up to 8% during the day. Although the performance was surprising, there was disappointment that it did not meet expectations, and concerns about excessive investment in artificial intelligence (AI) were again highlighted. KOSPI dropped to the 7,400 mark during the day, and the sixth circuit breaker (temporary suspension of stock trading) this year was activated. On this day, KOSPI ended trading at 7,656.31, down 4.91% from the previous trading day. It fell more than 8% during the day, falling to 7,392.04 and breaking the 7,400 mark. After 7 trading days since the 26th of last month, the selling sidecar (temporary suspension of program selling price) and circuit breaker were activated one after another. This is the sixth time this year that the circuit breaker has been activated. Samsung Electronics plunged more than 10% during the day, but rebounded slightly and ended trading at 296,000 won, down 6.92% from the previous trading day. SK Hynix closed at 2.201 million won, down 6.06%. KOSPI market capitalization, so-called ‘S7’, including SK Hynix