Ask what Korea is talking about.

South Korean stocks fell sharply on Oct. 30, with the KOSPI dropping more than 3% and briefly sinking over 5% late in the morning, as losses in U.S. technology stocks and worries about returns on AI investments triggered selling in heavyweights Samsung Electronics and SK hynix (Korea Times, Yonhap). The market opened sharply lower after major U.S. big tech firms, including Alphabet, plunged overnight, with concerns over prolonged Fed tightening adding pressure (Business Korea). Yonhap reports Seoul shares dipped over 3% on the tech sell-off amid AI concerns. Korean investors are reacting with alarm, as the sell-off reflects broader anxiety over the sustainability of the AI boom and the cost of financing AI investments, with Amazon, Microsoft, and Alphabet earnings seen as a key test (Korea Times).