Once Upon a Time in High School: The Spirit of Jeet Kune Do () is a 2004 South Korean drama film. The background of the film is set in a high school in South Korea, 1978. The original Korean title literally means "cruel history of Maljuk street" and one of the filming locations was the present neighborhood of Yangjae-dong, Seocho District in Seoul. Synopsis 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 (as was common up into the 1970s). 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 treats 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