In the spring of 1978, Hyun Soo transfers to Jungmoon High School in Gangnam, where his mother thinks the land price will skyrocket due to the development of the area. Yet, Jungmoon High School is notorious for its severe corporal punishment by teachers and power struggles between school gangs.
On the first day, he gets spanked with an aluminium baseball bat for violating the school's dress code. Then, one day, he plays basketball with his classmates and brings his team a victory, which allows him to become chummy with Woo Shik, a kingpin of the school. Before long, they find out that they both are huge fans of Bruce Lee and become best friends.
After school, on the bus, Hyun Soo and Woo Shik see a girl who resembles Olivia Hussey, the most popular foreign actress in Korea at that time. Her name is Eun Ju, a senior at a nearby all-girls' high school. Both fall in love with her at first sight. Hyun Soo is gentle and kind, while Woo Shik is tough and charismatic. Knowing Woo Shik is so different from her, she can't help and becomes attracted to him.
Hyun Soo endures the pain of his secret love for Eun Ju. However, Eun Ju and Woo Shik begin to bicker over petty things. While she's in pain over Woo Shik cheating on her, Hyun Soo sees a chance to win her heart. In the meantime, Woo Shik and Jong Hoon, a student patrol captain, get into a fight. In the duel, Jong Hoon cheats and beats up Woo Shik, who leaves school in the aftermath of his defeat.
With Woo Shik gone, Jong Hoon abuses his power as student patrol captain and bullies whoever gets in his way. Hyun Soo falls into an Inferior Class, and Jong Hoon keeps bullying him. The corporal punishment and favouritism by the teachers gradually become worse. To make matter worse, Eun Ju chooses Woo Shik over him. Driven to the wall, Hyun Soo explodes. With nunchakus tucked in the back of his pants, he goes up to the roof after Jong Hoon. Add Synopsis In Portuguese