A Yin and A Hua lost their mother when they were young. They wandered from place to place, suffering hardship and mistreatment, until one day they met an old man who had come down from the mountain. He took them up the mountain and taught them the skills to subdue demons and tame tigers. After coming down the mountain, they treated the sick and dispelled misfortune for the people. Their reputation gradually grew until, in the eyes of the world, they became little celestial masters of the mortal realm.