Yn was raised in a gang. The gang was protective of her and raised her better than most parents. They never got yn involved in their business (at least not on purpose). They made sure yn was doing well in school and helped when they can. If they aren't able to help because of being busy, they leave her with someone they trust. If they themselves don't understand they ask for help too as they help yn. They no doubt teach yn how to fight, so well when training, yn sometimes kick their butts, makes them proud. When they hear yn was joining erpb, they were happy, because sometimes kids need a beating. They aren't exactly good people, but they never interfere with any childs education. Maybe some are in prison, same one in episode 6. If you're wondering "why are these guys in a gang and doing illegal stuff?" Let's just say they thought it was their only option.