With nowhere else to turn, graduate Chen Mo rents a cheap apartment in the west of the city. But behind the bedroom wardrobe, he discovers a hidden door. A yellowed note wedged into its crack warns: "Never turn on the lights. Shine a flashlight at the mirror."
At midnight, the mirror reflects not his face, but a woman in a bloodstained white dress. She grips the mirror frame and whispers, "At last, someone has come to take my place..." Chen Mo soon discovers that the doors and windows have been sealed shut. He has become the newest prisoner in this living cage.
Freelance writer Lin Yuan follows his dreams and urban legends to the apartment, and the two strangers form a fragile alliance of convenience. They discover that the mirror follows cruel rules: certain kinds of light activate it, physical contact deepens the connection, and fear is its most nourishing food. Worse still, the supernatural phenomena are spreading from the mirror throughout the entire apartment building.
As their investigation deepens, the disappearance of Su Wan, a schoolteacher from forty years ago, comes to light. The diary of Xiaoyun, a tenant from over a decade ago, reveals the horrifying truth behind the "replacement." This is no simple haunting, but a cycle of curses stretching back over a century. Chen Mo is no accidental victim: his bloodline is inextricably linked to the dark arts practiced at the Su family's old residence during the Republic of China era.
When the evil spirit in the mirror breaks free, and the boundary between history and reality begins to blur, Chen Mo and Lin Yuan must search for a way to survive in the depths of despair. Their relationship evolves from a trade of favors to a bond forged through life and death. In the end, they discover that the key to breaking the cycle may lie in the original sin and their deepest bond.
Through layers of mounting horror, this story explores humanity's struggles and brilliance in the face of despair. Can they find a path to redemption?
