The KOSPI opened at 6,759.95 on the 21st, down 92.63 points, or 1.35%, after surging 381.41 points, or 5.89%, to 6,852.58 in the previous session. The retreat followed renewed increases in long-term U.S. Treasury yields and broad declines in New York stocks, where the Dow Jones Industrial Average fell 1.32%, the S&P 500 dropped 0.87% and the Nasdaq lost 1.00%. The U.S. 10-year and 30-year Treasury yields rose to 4.70% and 5.24%, respectively, reviving concerns about the fiscal deficit and government bond supply despite expanded Treasury buybacks. Samsung Electronics fell 0.74%, while SK hynix gained 0.30% and Samsung Electronics preferred shares rose 0.89%. Foreign and institutional investors were net sellers in the KOSPI, while retail investors bought. The KOSDAQ also opened lower, declining 2.00% to 824.05, with most large-cap stocks falling. Analysts Seo Sang-young of Mirae Asset Securities and Han Ji-young of Kiwoom Securities said market weakness could persist, although firm memory-chip shares, potential shareholder-return policies and relatively limited valuation sensitivity to interest rates could provide support.