Bao was a boy who was interested in martial arts, thanks to his mother, Chika. He grew up to become a boxer. One day, he came across Dio, fighting off a bunch of thugs, and this sparked his interest in growing stronger to help people. Chika, on the other hand, worried about her child getting injured and argued with Bao, resulting in Bao leaving home. As time passed, Dio asked Bao why he decided to follow him. That reminded Bao why he was interested in martial arts, it was to protect his mother and so they reunited.