Boxing Champion: Sherlock

Sherlock, the heir of the three biggest gangs in the United States, was exiled to Houston because of the family fight. When he grew up, he became a famous boxing champion of the gangs with his own hands in Houston.
Five years ago, in a murder, Sherlock was put behind bars for his leader.
Five years later, Sherlock's family found him and let him out of the prison successfully.
But when Sherlock returned to Houston, he found that his only sister Laura had become a prostitute.
His ex-girlfriend Linda became his former leader's plaything.
Sherlock was so angry that he wanted to kill all of the enemies in Houston!