Fight Back to School

A brash police officer assigned undercover to Edinburgh College. He initially dislikes schooling and struggles academically, but his wit and charm help him win peers’ respect. His loyalty to Tat and willingness to risk himself fuel the mission and lead to a climactic rescue.

An ageing, impulsive detective who partners with Sing. Listed as Sing's legal guardian on files, he exerts authority with brute force but also shows vulnerability. The duo’s chemistry drives many of the film’s comic and action beats.

Guidance counselor at Edinburgh College who tutors Sing. She becomes entangled in a complicated romance with her boyfriend, Detective Wong, and grapples with Sing and Tat’s true identities. Her presence marks the emotional center of the school-based storyline.

The school bully who challenges Sing on the rooftop. He’s protective of Turtle and serves as a rival who drives some of the conflict, ultimately contributing to Sing’s ascent among peers.

Sing’s classmate who cheated on a test but gained Sing’s protection. He becomes an ally during the final showdown and helps Sing navigate the maze-like school setting.

Arms trafficker boss who threatens Miss Ho and the students. His pursuit drives the climax and showcases the film’s blend of action and comedy.

Senior officer who supports Sing’s undercover assignment and promotes him to Chief Inspector after the mission. His leadership frames the stakes of the operation.