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Lin Mo, a graduate student in folklore, witnessed his family members being killed by bizarre folk rituals as a child. From then on, he was obsessed with using reason to deconstruct all supernatural phenomena, trying to find logical chains in the chaotic horror. When the ancient curse "it" awakens again - this regular existence that feeds on human fear and is as precise as a cold program - Lin Mo is forced to cooperate with forensic doctor Su Wan who only believes in physical evidence. One of the two pursues the invisible logic of fear, and the other holds on to tangible scientific evidence to explore the truth on the edge of sanity and madness. Behind the scenes, retired professor Chen Jing's guidance is vague, and reporter Zhou Yuan's information is difficult to tell whether it is true or false. Lin Mo gradually discovered that the rules of "it" were far more complicated than imagined, and everyone who was close to the truth became a pawn in the paradoxical dilemma. When childhood trauma intersects with the horror before his eyes, he must face the cruelest question: when fear becomes the only reasonable explanation, how much sanity is left?