Tae-seong, a mixed martial arts professional with excellent skills, is injured and got disqualified as he gets caught up in a fight with his friend Byeong-jin inside a store ahead of his UFC debut. Hye-na, Byeong-jin's younger sister and BJ professional in mixed martial arts, encourages Tae-seong to make a comeback, but Tae-seong refuses. Hye-na finds out that the man who injured Tae-seong is Yang Ho-yeol, the strongest champion of "Blood Street", an illegal gambling game site where one can bet...