Sang Ho is an ordinary high school student. His dream is to enter the military academy under the influence of his father, who is an army colonel. As entering high school, he became friends with Jae Gu, Chang Bae, Kyung Chul, Hong Kyu and Sang Sik. They grouped a soccer team called `Tiger`, building up friendships by playing soccer. Sang Ho and his friends ran into a group fight with seniors, and these incidents made everybody in school misunderstand them as they were a serious group of gangsters. When Sang Ho becomes close with a girl whose boyfriend is the boss of another school`s gangster group, things are getting worse.