Have you ever had this feeling: that the person in the mirror is always half a beat ahead of you? Lin Wan thought she'd simply gotten a bargain by moving into a haunted house, only to discover that a perfect copy of her lived in the mirror. It imitated her makeup, her way of speaking, even the way she loved her friends. When her friend died before her eyes and the surveillance footage showed another “her” walking away, Lin Wan broke down. She smashed the mirror, only to discover a shocking secret behind the wall: every “tenant” in this building was repeating the same fate of being replaced. And just when she thought she was the only survivor, the reflection in the mirror slowly spoke: “Shh. Actually, you're the tenant who shouldn't exist.”