Children of other ethnicities who saw the fight joined in angrily to beat him up. His father threw some money to rescue him from the group of children, only then realizing that the reason he had gotten into a fight was that he saw a little boy trying to steal his wallet. His father recognized that he was different from those children, knowing that he wasn't begging but had simply nowhere to go. Upon learning that he was an orphan and alone in a foreign land, he decisively decided to adopt him, at least nominally.
But he didn't benefit from his father's kindness for long. At the age of fifteen, he began looking for ways to make money with his own hands, and soon established 'Hidden' using his own smarts and wits. From the original few people to now tens of thousands, although his father had provided financial support when he was expanding his territory, he had long since repaid it over the years.