Class struggle and violence between residents in an isolated high-rise apartment. This high-end apartment has 40 floors and more than 2,000 independent suites. It is equipped with supermarkets, swimming pools, elementary schools and other living facilities. Each floor is connected by a high-speed elevator, forming a small society completely independent of the outside world. However, this seemingly perfect world is extremely fragile. A small power outage and trivial neighborhood disputes can trigger conflicts. As the conflict escalates, the people in the building are divided into three camps: the lower-class residents living on the bottom floor, the middle class living in the middle, and the rich class with luxury apartments on the top floors. Residents of different camps began to use violence against each other for limited public resources. The rules of the civilized world no longer apply here, and are replaced by the law of the jungle.