Elevators in the city frequently lose control, carrying people into the mysterious negative floor. Gu Qian and others are trapped inside. Not only do they have to face the disappearance of floors and the stopping of time, they also have to accept the life and death verdict of the outside world's "barrage voting". As the 4040Hz tinnitus intensifies, they discover that the system runs on the heartbeat of the missing person, and this horror is no accident. It is the beginning of the cancerous transformation of silent city civilization. Escape from the elevator is just the first step in a cycle of despair.
