The Apartment.

In a dilapidated apartment, lives intertwine: a lonely, voyeuristic landlady, college student Wan Li, and a provocatively dressed female tenant. Wan Li rents the place for privacy with his ambivalent girlfriend, who later falls for his visiting junior. Ironically, while kissing her, the junior fantasizes about Wan Li himself—sparking a tangled web of unspoken desire and fractured loyalties.