Heung Wing has been sensitive to paranormal activity and keeps seeing ghosts since he was a kid. One day, Heung Wing receives news that his mother is in coma after committing suicide, which forces him to return to the old home. Everything seems strange and weird.

Ms Chan, a social worker who has just returned to work, receives her first case. She pays a visit to Jia, a single elderly who seems to have accidentally dialled the Care-on-Call Service. Jia has suspicious bruises on his face and Ms. Chan senses a possible family abuse situation. However, Jia’s attitude is unwelcoming and he sends her off right away. Since then, a series of peculiar events make Ms. Chan question her own sense of reality and sanity.