Hyun-soo (
Kwon Sang-woo), transfers to a school that is notorious for its poor outcomes and brutality. He joins a bottom-rank class and experiences violence by delinquents led by Jong-hoon (
Lee Jong-hyuk), a stereotypical Korean bully. The teachers are depicted as authoritarian and brutal. On the bus, Hyun-soo sees and falls in love with Eun-joo (
Han Ga-in). When schoolboys start teasing her, Hyun-soo takes the opportunity to gain her respect, even though it starts a riot. After the two are chased and caught in their hiding place, one of Hyun-soo's friends Kim Woo-sik (
Lee Jung-jin), steps in and knocks out the attackers. A love triangle is formed between Hyun-soo, Woo-sik, and Eun-joo. One day, Hyun-soo notices Woo-sik and Eun-joo arguing. Despite his only achievement being sharing an umbrella with her, he meets her on a rooftop that night and they bond with each other while Woo-sik jealously observes them in secret. One day Hyun-soo and Woo-sik get in a fight over Eun-joo and their friendship ends. Woo-sik then humiliates and beats up Ham Jye-bok or "Hamburger" (
Park Hyo-jun) who sells pornography to other students. Woo-sik then loses an intense fight with Jong-hoon on the rooftop and leaves the school, presumably having dropped out. Hyun-soo concludes that Eun-joo has left him for Woo-sik. Hyun-soo's father is a black belt in
Tae Kwon Do and an owner of a Tae Kwon Do gym; he treats his students kindly while treating his son poorly. When he discovers that Hyun-soo has been receiving poor grades, he beats him, refers to him as "surplus man" (a derogatory term for a person without a future), and kicks him out of his house permanently. No longer able to put up with the conduct of Jong-hoon, his gang, nor the brutality and violence of teachers, Hyun-soo trains himself in
Jeet Kune Do, inspired by his childhood hero
Bruce Lee. One day, on the same rooftop where Woo-sik lost his fight with Jong-hoon, Hyun-soo uses
nunchaku and his new-found expertise in Jeet Kune Do to grievously injure Jong-hoon and his gang mates. When authorities blame Hyun-soo, he lashes out. Smashing windows and throwing his nunchucks, he curses Korea's entire education system for being so corrupt and encouraging brutality. Hyun-soo is expelled and sent to a public school. Jong-hoon's mother blames him for beating her son, forcing his father to apologize to her for his son's actions. Hyun-soo apologizes to his father about the incident and they eventually reconcile. His father tells him that he can always get a GED and asks if Bruce Lee went to college, knowing full well that he didn't and realizing that a good man isn't defined by a college education. By chance, he runs into Eun-joo. Hyun-soo later attends a movie with Ham Jye-bok and both goof off with mock martial arts over Bruce Lee vs Jackie Chan. ==Cast==