South Korean stocks opened higher Monday, led by gains from top-cap Samsung Electronics and other major tech shares. The benchmark Kospi added 19.51 points, or 0.78 percent, to 2,520.75 in the first 15 minutes of trading. The increase was driven by institutional buying, which offset selling by foreigners and retail investors. On Friday, the Kospi rose above 2,500 points for the first time in 11 sessions following a sharp drop the previous week amid concerns over expected policy changes by the