Yeh Hsin is a top student in criminal psychology while her father is a distinguished cardiologist. Her boyfriend, Lin Miao, is a young forensic specialist. Everything seems perfect for Yeh Hsin until human remains are discovered in her backyard one rainy night. Around the same time Yeh receives a mysterious letter warning her that her life is about to change drastically.

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.