Tawee Visanulorn

Fak, a young Thai man who leaves the monkhood to care for his ailing father. When he returns home, he finds his father has married a much younger woman. She is very beautiful, but she is also mentally unbalanced.

Before her death, a grandmother gives her granddaughter a magical ring that'll give her dead spirit power over her. The spirit manifests itself when her head detaches from her body at night and flies away with guts dangling under it, seeking blood to drink or raw flesh to devour.