This is McChucheon Daniels or MD. He lives in a bad neighborhood in Detroit with his little sister and drug addict dad. He takes care of his sister pretty much by himself and is responsible for providing money for the family.
MD fights in an illegal underground fighting league and his dad bets money on him in order to provide for his family. While every time his dad takes most of the winnings, MD is usually left with maybe $100 out of the thousands made per match to live off of until his next fight.
One day MD wants to win a belt and become world champion in the MMA so he can get out of the ghetto and provide a good life and opprotunity for himself and his little sister. Because of this big ambition MD trains long and hard every day to make this possible.
MD gets an offer to get out of his crappy ghetto public school and go to an extremely nice private school. Here he meets Kaitlyn, likes the school, and begins to rethink his plans for the future.
MD's Dad figures this out and takes his little sister in order to keep MD fighting. MD then loses his next fight on purpose in order to get his dad in trouble with the Priests and so he can finally quit for good.
MD is living a better life going to a great private school, living with his mom in a good home, and dating Kaitlyn. Until the FBI shows up to put him and his family in the witness protection program because the Priests are after his family.