Two mismatched Hong Kong police detectives, Yau and Yue, were assigned to work undercover as a live-in couple to track down a serial killer accused of murdering adulterers. In the meantime, Yau (Anthony Chan) is coping with his girlfriend having left him, and Yue (Sandra Ng) is losing her boyfriend to a college girlfriend of his.

• Golden Harvest Productions
• Sandra Ng Kwan-yu
• Anthony Chan Yau
• Carrie Ng Ka-lai
• Alfred Cheung Kin-ting
• Jamie Luk Kim-ming
• Michael Chow Man-kin
• Woo Fung
• Tam Sin-Hung