Seoul shares opened sharply lower Tuesday as investors reacted to overnight losses in U.S. technology stocks and remained cautious ahead of Nvidia's upcoming earnings release. The Kospi, South Korea's benchmark stock index, opened down 2.4% and was 244.84 points, or 3.66%, lower at 6,452.12 at 9:15 a.m. The index had already fallen more than 3% in the previous session as chipmakers, such as S, declined sharply.