Yu Kai is the son of Luo Yingxue and Yu Hua. He is a high school student struggling with academic pressure and the stigma of being a poor performer in a key school. After being framed for picking up a bag, his mother resolves the situation but later reveals her true identity. Yu Kai is initially naive about his mother's power but gradually learns about the spiritual world and his father's legacy as a Celestial Lord. He attempts spirit induction but fails, instead feeding spiritual liquid to a piglet that becomes a demon. He is kind-hearted and protective, shown when he catches the piglet and pleads for its life. His journey involves discovering his own potential and the mysteries of his heritage.
