Ma and Sze are buddies from the same school. Rebuked by Jaa, a tough guy from another class, Sze urges Ma to revenge for him. Meanwhile, Jaa and his gang continue to bully Ming, a weakling in the group, by stripping him naked in front of the class. Ma and Sze challenge Jaa and company to have a flight after school, but are so absorbed in playing mischievous tricks to the Headmaster’s office that they miss the appointment. At night, Jaa walks pass a foot-bridge and finds one of the teachers he dislikes most waiting for the bus under the bridge. Jaa picks up a stone and is ready to aim it at the teacher when suddenly someone appears behind film…