Who does Xifeng in Sword and Fairy 3 love the most? Who is he? Why did he become a demon? How powerful he is. Please explain why.

Xifeng has a fairy who loves him the most. He has a very good voice and often sings at the beach. His singing is recorded in a shell. The shell is received by the fairy he loves. The fairy likes to listen to his voice and comes down to find him. But Xi Feng grew ugly and refused to see him, so he asked the demon Zun Zhenglou to use his voice to change his appearance, and promised to be his slave for 500 years. Then he played with the fairy he loved for a day and then went to do it. He became a slave and gave a letter to the fairy saying that if he waits for 500 years, he will become a demon. He is not powerful. But when he did not come back after 500 years, the fairy became petrified! The fairy’s name is Shuibi