South Korea's main stock index suffered its largest weekly sell-off by foreign investors in the first week of November, the Korea Exchange said on Sunday, as profit-taking and fears of an artificial intelligence (AI) stock bubble caused the market to fall. Foreign investors sold 7.26 trillion won (about $4.98 billion) worth of stocks from Monday to Friday, the exchange said. The amount set a record for the largest single-week sell-off by foreign investors in the history of the Korea Composite St...