Sing quits the force after getting demoted to traffic duties, while his partner is assigned a mission involving foreign terrorists threatening to bomb a school in Hong Kong, so Sing decides to help by going undercover at the same school.

On the course of a case involving terrorists, Sing has been demoted to traffic duty. After feeling insulted being assigned to traffic duty, he quits the police force. Having no money left and a degrading marriage and bank account, he decides to do the thing he does best, to be an undercover cop.—Jackie Ng <[email protected]

After not making the chief happy, Chow sing sing is demoted to traffic duty. He quits and goes undercover at a high school, with some friends from the school he went undercover for the firearms case, for a terrorism case to show them that he can do the job.—<[email protected]>