Watch Love Undercover

Love Undercover is a 2002 Hong Kong film about a young rookie cop from the academy, Fong Lai Kuen (played by Miriam Yeung) who is picked by the Serious Crime Unit for an undercover job as a waitress so that she can get close to a suspected gangster, Hoi (played by Daniel Wu) and plant a bug on him. But then the mission starts going sideways when Fong realizes that she is falling for Hoi, who is also romantically interested in her, and her bosses have to decide whether she is the right person for the job.