Once Upon A Time In High School (2004)

Cast
kwon Sang-woo (권상우) as Hyeon-Soo
Lee Jeong-jin (이정진) as Woo-Shik
Han Ga-in (한가인) as Eun-Ju
Kim In-kwon (김인권) as Jiksae
Park Hyo-joon (박효준) as Hamburger
Lee Jong-hyuk (이종혁) as Jong-Hoon
Seo Dong-won (서동원) as Seong-Hun
Baek Bong-gi (백봉기) as Cheetah
Choi Jae-hwan (최재환)
Ahn Nae-sang (안내상) as Math teacher

Also known as "Spirit Of Jeet Keun Do"

Trailer

Synopsis
In the spring of 1978, Hyun-soo (Kwon Sang-Woo) transfers to Jungmoon High School in Kangnam 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 aluminum 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-sik (Lee Jung-Jin), 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-sik see a girl who resembles Olivia Hussey, the most popular foreign actress in Korea at that time. Her name is Eun-ju (Han Ga-In), a senior at a nearby girls high school. Both fall in love with her at first sight. Hyun-soo is gentle and kind, while Woo-sik is tough and charismatic. Knowing Woo-sik is so different from her, she can't help but becomes attracted to him.

Hyun-soo endures the pain of his secret love for Eun-ju. However, Eun-ju and Woo-sik begin to bicker over petty things. While she's in pain over Woo-sik cheating on her, Hyun-soo sees a chance to win her heart. In the meantime, Woo-sik and Jong-hoon (Lee Jong-Hyeok), a student patrol captain, get into a fight. In the duel, Jong-hoon cheats and beats up Woo-sik, who leaves school in the aftermath of his defeat. With Woo-sik 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 favoritism by the teachers gradually become worse. To make matter worse, Eun-ju chooses Woo-sik 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.