South Korean stocks extended their losing streak to a fifth consecutive session Wednesday as rising US yields and rate hike forecast weighed on investor sentiment. The Korean won fell against the US dollar. After a choppy session, the benchmark Korea Composite Stock Price Index (KOSPI) declined 21.96 points, or 0.77 percent, to close at 2,842.28 points. Trading volume was moderate at about 457 million shares worth some 9.6 trillion won ($8.1 billion), with losers far outnumbering gainers 653