Real estate agent Meng Fan took over the sale of the "Huaiyin Apartment", an old bungalow with a complex history and repeated strange murders that could never be demolished. The company promised a high commission and gave him a mysterious "copy of the property deed," claiming that the holder could temporarily live safely and understand the rules of the apartment. Meng Fan took a risk and moved in for money, and found that the apartment would distort the space (such as infinitely extending corridors, disappearing rooms, changing false scenery outside the window) based on the residents' deepest desires/fear, and set up "rule traps." Once a resident violates a rule (such as responding to a knock on the door after midnight, entering a specific room, or revealing the secrets of the apartment), he will be "swallowed" by the apartment - not dead, but erased from existence, and one of his most outstanding "traits" (such as talent, beauty, courage, memory) will be absorbed by the apartment, becoming part of its rules or nourishing the next "trap."