despite being the person everyone trusts and relies on, he resents being the only "ma gua" (麻瓜) in the family and doing the menial jobs around the home. his resentment grows when he finds out that his mother had given the "feng long ka" (封龍卡) to xia tian instead of him, the eldest son, because of his ma gua status. evil sees his jealousy and uses that to turn him evil by giving him a ring to absorb other people's powers. the ring unwittingly unlocks xia yu's sealed power. as it turns out, he is not a ma gua by birth. rather, his father secretly sealed his power upon birth because he exhibited the pure evil genes. when he fully comes into his powers, his dark instincts start to take over. the situation forces his father to use "xi hun qu" (洗魂曲 / "soul cleansing melody") to cleanse his soul and seal his power again.