The "Anju Apartment" with a monthly rent of 300 yuan is an inconspicuous stain on the city map, and it is also Zhang Chen's desperate choice. But he soon discovered that the cheapness here needed to be paid for with something more precious than money.
The elevator stops at non-existent floors, the number of stairs changes every day, and unknown whispers come from the walls late at night. The residents are in a hurry, adhering to a set of cold and strange survival rules: when to use water, when to be silent, and when to ignore the crying outside the door. Those who violate the rules will be "purified" - not death, but a more complete disappearance.
Zhang Chen originally wanted to survive, but unexpectedly found that he had become a variable that broke the fragile balance. He is forced into a silent war: competing with the administrators who set the rules, dealing with the collectors who collect "anomalies", and finding life in the slowly awakening malevolence in the apartment itself.
He gradually realizes that this building is not a haunted house, but a living tombstone, imprisoning an ancient and terrifying existence. All residents are the "fuel" to maintain the seal. Behind the rules is a failed scientific ritual and an ultimate secret related to the survival of reality.
When the knock on the door next door rang again, Zhang Chen held a rusty iron key from the origin of the apartment and stood at a crossroads of choice: to become a sacrifice to maintain order, or to become the fire that ignited the entire prison?
