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In a snow-covered northern border town, a series of disappearances occurred seven years ago, but the police failed to solve the case. Seven years later, a missing person "returned", but it was as if he had been erased from time - no memory, no identity, no shadow. Psychology expert Lin Zhihui was invited to investigate, but received a mysterious recording on the night of arrival: "Don't trust anyone, including yourself." As the investigation deepened, Lin Zhihui discovered that all the missing persons had participated in a secret experiment called "Project Zero." And she herself may be the final product of the experiment. On the boundary between truth and illusion, she must find the source of the "zero echo"-- Otherwise, what disappears next time will be her own "existence".