Passion Unbounded (1995)

The story follows a young woman, Ah Ling (played by Wu Jia Li), who ends up on the streets due to family misfortune and unwittingly enters the territory of a gang boss (played by Cheng Tse Sing), where she is forced to become his mistress. Ah Ling endures torment in the gang environment while encountering the enigmatic man Ah Wei (played by Leon Lai). The two develop a forbidden romance. However, internal gang power struggles and Ah Ling's thirst for revenge gradually drive everything toward madness. The film features extensive Category III elements to depict the characters' desires and violence. The title "Category IV Murder Maniac" stems from the protagonist's extreme killing spree unleashed in passion and hatred, culminating in a bloody finale that reveals the distortion and eruption of human nature under oppressive circumstances.