Rule 13 of the White Birch Apartments

In order to find his missing sister, detective Chen Gu steps into an apartment governed by strange rules - the elevator always stops on the 7th floor, there is always an extra box of milk in the refrigerator, and the 13th reflection in the mirror will smile at you. Those who break the rules will become puzzle pieces, while those who follow the rules will subtly become the "nutrients" of the apartment. The bronze compass left by my sister can reveal loopholes in the rules, but the price is that Chen Gu's body is gradually rusting into metal. What's even more frightening is that he discovers that all the rules have been changed by his sister, and the black cat raised by the administrator, the neighbors who change their faces every day, and the woman with a red umbrella who appears in the rainstorm all seem to be leading him towards a cruel truth—— This apartment is alive, and he himself may have been part of the rules. When the clock strikes midnight and the moon phases begin to change, Chen Gu must make a choice before the last rule takes effect: become the new rule maker, or be completely swallowed up by the apartment... **