South Korea's stock market is facing a liquidity test. The approximately $40 billion stock buyback programs by Samsung Electronics and SK Hynix, which had previously supported the Korea Composite Stock Price Index (KOSPI), concluded several weeks ahead of schedule. As a result, the KOSPI index fell 2% on Wednesday (October 7), once again dropping below the 7,000-point mark, with foreign investors net selling $1.9 billion in a single day. Concurrently, Samsung Electronics' third-quarter revenue and operating profit both fell short of market expectations. Goldman Sachs noted that today (October 8), the South Korean stock market will also face multiple overlapping events, including semiconductor ETF rebalancing and options expiration, leading to a sudden increase in market volatility risk.