A young policewoman is picked for an undercover job--getting close enough to a gangster's son so that she can plant a microphone at a table where the gangsters make their deals. Complications arise when she finds herself falling for him.

Fong (Miriam Yeung) is already at odds with Wu (Edison Chen), one of her bosses at an ad agency, when she makes a major mistake at work that puts her job on the line. To save herself, she feigns pregnancy, which, under Hong Kong law, means she cannot be fired for 10 months. However, while there may be some perks that accompany her "pregnancy," she is eventually forced to concoct increasingly elaborate lies and involve everyone around her in the charade.

The Crime Investigation Department is assigned to protect a princess-consort coming from the Republic of Puerto Risi. They arrange a fantastic trip to introduce the princess-consort to Hong Kong, but a big crisis looms on the horizon.