On the eve of the announcement of Samsung and SK Hynix's massive investment plan, South Korea's composite stock index fell.

The main stock index in South Korea, KOSPI, once plummeted by 3.1%, with SK Hynix and Samsung Electronics seeing a decline in their stock prices. It was previously reported that the two companies will invest up to 20 trillion Korean won in the next decade. The stocks of Samsung and SK Hynix were the biggest drag on the index. Roy Lim, a stock sales trader at Seoul's NH Investment & Securities, stated that institutions are generally bullish on South Korea's special power equipment and power grid-related targets becoming the beneficiary sectors of this investment. As of now, KOSPI has risen by 93% this year. Eugene Securities analyst Huh Jae-Hwan pointed out in his research report that the South Korean domestic stock market is volatile, with the core reason being a lack of competitive alternative tracks besides semiconductors. He added that this large-scale industrial project will benefit companies in the semiconductor industry chain and help alleviate industry capacity bottlenecks. "The leadership position of the semiconductor industry seems unlikely to be structurally weakened. However, temporarily avoiding extreme fluctuations may be a prudent strategy," he said. The Kosdaq index once rose by 5%.