Wao is an 18-year-old who intends to join the police force. She is intelligent, defensive and tactful to get advantages from others. In one occasion, she rescues Sergeant Chung and his team. To express his gratitude, Chung perusades Wao to join the police force for the high salary and he returns to the police-teaching academy just to assist Wao to graduate successfully. Wao then joins Chung's team, they spoil her and the spirit of the team drops.
Senior officer, Madam Lui, sends Izu to spy on Chung's team and photographs their misconduct as "evidence". The team become friends with Izu while Wao is even attracted by his gorgeous look and co-operates with him in his "secret mission'. Laughs burst out in the police office while Chung's team is ignorant of Izu's real intention. Yet, a plot is being set up by Izu unnoticeably. Wao is in great dilemma and what will Wao choose between friendship and love?