South Korean stocks opened sharply higher Friday backed by gains of big-cap tech and financial shares. The benchmark Korea Composite Stock Price Index rose 38.36 points, or 1.43 percent, to 2,727.86 in the first 15 minutes of trading. Overnight, the US stock market closed mixed as investors remained cautious ahead of key jobs data to be released later in the day, which will likely set the tone for the Federal Reserve...