Rho wasn't born yet when his father died during a mission, which led his mother to fall in a deep depression. She ended up getting sick and they didn't have the money to pay for the medical bills so Rho decided he would become a ninja just like his father and would bring the money to help her. He used the few Ryos they still had and went to the academy. After his first day, the joy he felt from starting his journey was broken when he came back home to find his mother sleeping forever. He swore to keep his promise, or at least a part of it, by helping everyone he could during his missions.
PS: good try looking at my profile, Yin but you ain't gana know