Programmer Yan Shu moves into a low-cost apartment, only to find a strange survival manual left by the previous resident: the rules are contradictory and will tamper with themselves. After nightfall, a monster claiming to be a food delivery boy knocks on the door on time, and the world outside the cat's eye gradually becomes distorted. He must rely on incomplete rules to survive the bloody door control, abnormal security and spatial mutations - in this apartment, wrong judgment can lead to death, but the right choice can make people crazy...
