I guess if we take any fighter and search for his story, then his life story would be worthy of a Netflix adaptation. People rarely go train any combat sport because of happy life. People rarely become a professional fighter only because they are good at beating other guys. Imho there is never a guy, whos parents were billionaires, and due to boredom, he began training martial art, all of a sudden he realises that he has a talent and becomes a champion. This is plot of a movie from 80s-90s only.
But there could be something like that as well a plot on why he became a fighter for me not because he is the son of a billionaire he would just become one and will be satisfied with what he has, for sure there is always will be a person that could potentially want something new entirely about his life that is not lining to his own father for sure there will be a person like that, and not because your parents is working in the office it doesn't mean that their child will also be working like that.
Search for a place where he was born. If the kid does not go to any wrestling or striking gym, he will be bullied everywhere and every time. Plus in the place where he is from, there isnt much to do. Its either go to gym with other boys, or I dont know, pick up a stick and hit grass. This is the problem of all Dagestani kids or if it is proper to say "mountain" kids. There is nothing for them to do. Either train or sit and wait till you retire.