Chung Lap Man (Ng Cheuk Hai, Ron) applies for the job of police constable to take revenge on police training instructor Lee Man Sing (Miu Kiu Wai). Ken Lee (Chan King Fung, Sammul) joins the police force for the attractive salary. He has no idea that his instructor will be none other than his ultimate enemy SING. MAN and KEN team up to fight against their prime enemy SING.

Ho Fa (Yeung Yi, Tavia) is the temporary staff at the school kiosk. She likes MAN, yet she avoids him because of her shameful family background. Meanwhile, KEN and his classmate Fiona Ma’s (Sit Hoi Ki, Fiona) relationship are also obstructed by their different family class.
The trainings are tough and intensive, but they at the same time have made MAN and HIU understand the true meaning of being a police officer. Their relationship with SING has improved too.