Fight Back to School

The undercover operation is made complicated when Sing is partnered with Tat (Ng Man-tat)—an ageing, incompetent police detective.

On just his third day at the school, Sing is on the verge of being expelled due to being caught cheating on a Chinese history test.

Tat, who is listed on files as Sing's legal guardian, beats him ruthlessly after much prodding from the school's administrative staff.

Already distasteful of police officers, Miss Ho is dismayed when she discovers both Sing and Tat's real identities and distances herself from the two.

After two months pass with little progress, Tat and Sing finally decide to pursue the arms traffickers and their boss, Teddy (Roy Cheung), who is also Johnny's older brother.

Sing manages to escape from the lot with a truckload of weapons and returns Wong's stolen pistol, but accidentally leaves Tat behind with the criminals, who hold him captive.