Na Du-su is a troublemaker who is a headache to his teachers and others as well. When he learns that his classmate, model student Ho-chul, is having difficulties, he tries his best to help him. In the end, their friendship transforms him from a troublemaker into a good student. Based on the 1976 novel of “Story of Yalkae” by Jo Heun-pa, this film began the boom in youth films and was followed by many sequels. The film was so very popular that the cast, Lee Seung-hyun, Kang Joo-hee and Kim Jung-hoon ? all high school students at the time ? became instant teen stars. It distinguished itself by its speedy and fresh change of scenes, witty lines and well-composed settings. Choi Chang-kwon’s score gives off a western-film-like feeling, yet this perfectly suits a film full of witty images.