Underworld College is a college. The protagonist is the student union president of Underworld College and the president of the Muay Thai club. He has no parents and only has one brother.
The elder brother was the No. 1 Of a gang in Underworld (that is to say, the gang was led by the elder brother). But unfortunately, his elder brother died. In order to avenge his brother, he recalled his brother's men, No. 2-No. 10.
Later. . . . . . .