To repay a debt of gratitude, Lin Tianlong, a top disciple from Kunlun Mountain, descends the mountain and becomes the supposedly useless live-in son-in-law of Su Muxue, president of the Su Group. Wearing a tank top and flip-flops, he appears carefree and lazy, but in reality, his medical skills are miraculous and his martial arts abilities are extraordinary. When family conspiracies, underground forces, and a blood feud dating back ten years come one after another, he makes his enemies disappear with nothing more than a casual smile. Watch as this peerless master pretends to be weak while secretly demonstrating his overwhelming strength in the city, protects his proud and headstrong wife, and stirs up a storm throughout Lucheng.