Sang-ho and his friends Jae-gu and Chang-bae create a boys soccer club called "Tigers".
Sang-ho, whose main passions are hitting the books and kicking a soccer ball, meets Su-hee through Jae-gu. Su-hee is polar opposite from Sang-ho. While he is the model student and athlete, Su-hee is a tough but pretty problem student. Their differences inevitably draw them together. But Su-hee belongs to Jong-suk, the leader of a teen gang calling themselves "T&T". The Tigers soon find themselves engulfed in a battle with T&T. When Sang-ho's friends become seriously injured during a fight with T&T, Sang-ho makes a choice he can't go back on