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Programmer Shen Chang rented the haunted house 1304 in the Gujin Building, opposite the elevator. Behind the ultra-low rent are 7 life-saving rules written in blood. In the early morning, the elevator lost control and jumped to the non-existent 31st floor. He ran into a mirror double that was exactly like himself. From then on, his life was stolen step by step: the perfect code, the absent family, the missed friendship, and even the secret love that he dared not confess were all perfectly taken over by the substitute. The first five tenants who moved into 1304 all died mysteriously on the seventh day. The 7-day countdown to death is approaching...