Love Undercover (2002)

Riding high on the success of her last case, police officer Fong has been assigned to another very important mission: to protect Princess Tasah, a princess-consort from the Republic of Puerto Risi. Fong's plans include taking the princess-consort on a visit around Hong Kong that the latter will never forget. Unfortunately, her intentions are foiled when a big crisis heads her way.

Kuen, a rookie cop who flunked every single important test as a cadet. However, Hong Kong needs cops, so she graduates anyway. Sentenced to the Lost Property Department, Kuen can only gossip with her co-workers and lust after hunk cop Hung.

However, Kuen gets her chance pretty quickly. The Serious Crime Unit picks her for minor undercover work because she has no family, boyfriend or dog and wouldn't be missed if the target decides to off her. She's assigned to bug suspected triad guy Hoi, but thanks to nutty situation comedy circumstances she ends up catching his eye. Hoi decides to pursue Kuen, and the Serious Crime Unit couldn't be happier. Led by Officer Chung and the previously-mentioned hunk Hung, the cops go about setting up an elaborate cover for Kuen. They plan to keep her close to Hoi in hopes of discovering his evil plans.

Female leads deceive male leads. Both female leads do so because of their job, and being pressured by their colleagues and superiors to get the job done, even though they’ve fallen for the male lead.