At an apparently peaceful school in a bustling city, student Wu Yuan unexpectedly becomes the only survivor of Haunted House No. 304. Then he discovers a countdown on his left wrist, pointing to the coordinates where the next haunted house will appear. A police investigation reveals a tiny microchip in the victims' cochleas, playing inexplicable childhood memories. Relying on his keen powers of observation, Wu Yuan struggles to uncover the truth under the pressure of the school's hidden undercurrents and the complicated rules of adult society. An evil organization operating in secret at the school uses the haunted houses to cause death and obstruct Wu Yuan's efforts. As the countdown nears its end, the thirteenth haunted house is about to appear in the apartment building where he lives. If he can't uncover the secret within 71 hours, he and many other innocent people will die. During the investigation, Wu Yuan is misunderstood by the police and those around him, leaving him facing a crisis of trust. But with a resilient heart, he struggles between fear and hope, refusing to overlook a single clue. Even if he succeeds in the end, he may still be unable to save everyone, and the cost could be devastating. With everything on the line, he engages in a life-or-death struggle against an unknown evil force, fighting for survival and the truth until the very last moment.
