A man, Gang Dae-han, 3rd year (12th year) of Taeyang (it means solar) high school. He's living with his sister who has not related. In front of his beloved Hyun Soo-yeon, he's weak, but he's a liberal who lives together in friendship and loyalty. Beginning with the return of the bully Shin Suk-ki, the school's trouble eventually invite blood, and Dae-han runs into a bloody fight for the hope of tomorrow.