Fight Back to School II

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.