Help find yaoi

It's a manhwa the pov is from the seme I think he is a gangster there's a flashback thing where we learn he and uke went to school together seme was going to become a boxing or other type of fighting sport athlete but he "threw that opportunity away" by beating up the uke's piano teacher for being a disgusting pedo rap*st and seme went to juvenile
Years later uke needs seme's help he can't play piano anymore something happened to his hands and his family went through bankruptcy and he is alone now