'美∼中 줄타기' 코스피 롤러코스터 뒤 2,150대 반등br br South Korea's main stock index closed higher on Friday... after a turbulent morning session. br The benchmark KOSPI closed at 21-56, up nearly Point-four percent from the previous session.br But during morning trading, it hit the lowest point since last March... dropping at one point to 21-18...mainly due to sharp dips in the U.S. and Chinese stock markets.br Analysts say the KOSPI's rebound followed a similar pattern in Beijing's stocks in the afternoon. br Seoul's junior stock index, the tech heavy KOSDAQ, also closed higher with a one-and-a-quarter-percent gain.