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In this world, there is a monster hidden deep in everyone's soul, which is called "spirit". Either control it or be controlled by it. Gu Sen and Xiao Heming are psychotherapists on the surface, but secretly one is a lunatic who feeds on "spirits", and the other is a sick man with the ability to purify "spirits." Xiao He was accidentally cursed by a "spirit" during a medical treatment, and his physical condition deteriorated day by day. As a last resort, Gu Sen accompanied Xiao He on his adventure...