Secondly.. the girl who used to live up stairs is the ghost (no shit), and she died when she fell into the water tank on the roof. Her ghost is just hanging around to find itself another mother because she got neglected by hers (Not sure if neglect is the right word, it's been ages since I last saw this movie). Anyway eventually the ghost, being the malicious biatch she is, is about to kill the main chick's daughter, when the main chick shows up. She goes over to the zombie/ghost girl and embraces her (to save her own daughter), and the ghost girl takes her away. 10 years later or something, the daughter, now in high school goes to the building where the ghost was again, and visits her old water leaky apartment again. She find her mother there, not having aged a day of course, and has a conversation with her. Then something happens and she turns away, and when she turns back her mother is gone. End. Not a very scary movie, but pretty well made.