Lu Ting, the former feared soldier king in the international mercenary world, secluded himself to wait for death due to a fatal fragment embedded in his heart. An accident forced him to take over the mess of the "human health inspector", and he gained the ability to see the "red line of fate" and the "black spot of illness". His mission is to resolve the world's emotional entanglements to cure a terminal illness in exchange for the merit of delaying his own death. However, the first patient he took over turned out to be a female doctor Shen Qinglan who was suffering from a strange disease - the dark aura in her body came from her obsession with sacrificing her younger brother, and her younger brother was the comrade who died to protect Lu Ting. Lu Ting had to atone for his sins and protect her, get close to the woman who hated him to the core, and use the method of the King of Soldiers to untie her knot. When he discovers that the only way to save her is to cut off the "red thread" connecting them with his own hands, a sadomasochism about forgetting, sacrifice and deepest protection reaches the moment of final decision.
