Referred to as Hong Kong's answer to "Misery", innocent-looking Bo-Bo Fung is an overprotective mother/nurse who is bent on revenge at all costs after the death of her son at the hands of policeman Lau Ching-Wan. Veronica Yip stars as a gambling addict who enlists Lau to protect her from loan sharks, and eventually returns the favor in order for him to survive Nurse Lam's relentless assault.

Referred to as Hong Kong's answer to "Misery", innocent-looking Bo-Bo Fung is an overprotective mother/nurse who is bent on revenge at all costs after the death of her son at the hands of policeman Lau Ching-Wan. Veronica Yip stars as a gambling addict who enlists Lau to protect her from loan sharks, and eventually returns the favor in order for him to survive Nurse Lam's relentless assault.