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.
- Genre: Thriller, Romance, Comedy, Crime
- Studio: Golden Harvest Productions, 嘉禾电影有限公司
- Keyword: romantic comedy, buddy cop
- Cast: Anthony Chan Yau, Sandra Ng Kwun-Yu, Carrie Ng, Michael Chow Man-Kin, Alfred Cheung Kin-Ting, Kenneth Tsang