Korean stocks ended mixed Tuesday, as the tech-heavy Kosdaq extended its rally on expectations of stronger investor inflows while continued weakness in major chipmakers weighed on the benchmark KOSPI. The benchmark KOSPI closed at 6,358.95, up 1.62 percent from the previous session. The index climbed to 6,389.40 shortly after the opening bell but reversed course later in the day. Foreign and institutional investors sold a net 369.7 billion won ($257.7 million) and 539.1 billion won worth of shares, respectively. Retail investors, meanwhile, bought a net 810 billion won. SK hynix rose 0.64 percent to close at 1,577,000 won, while Samsung Electronics gained 0.21 percent to finish at 240,000 won. Sentiment toward memory chipmakers continued to weaken overnight following reports that China's largest memory chipmaker, CXMT, is considering building a new semiconductor plant in Beijing. Although details such as production capacity and investment size were not disclosed, the prospect of increased memory supply added downward pressure to chip stocks. Still, U.S. memory chip stocks managed to rebou