South Korean retail investors, known for their aggressive trading style, are ramping up exposure to Chinese artificial intelligence-related stocks, even as their home market ranks among the world’s top performers. Data from SEIBro, a portal operated by the Korea Securities Depository, showed that South Korean retail investors bought US$507 million worth of Hong Kong-listed shares and US$154 million of mainland-listed shares between January 2 and Monday. The data showed that total purchases had...