K-pop ballads get a boost from Yoon Il Sang, a long-established composer who has helped pen slow-burners for some of Korea's biggest names. He's added an extra skip to otherwise string-swelling numbers for soulful singer Kim Yeon Woo, while blessing midtempo numbers by vocalist Lee Eun Mi with Parisian flair via accordion. He's a master at spicing up ballads without losing the emotional core.