What is the reason why Xu Yi betrayed King Lear?

Xu Yi thinks he is not good enough for King Lear. King Lear is simple and beautiful, gentle and determined. Although Xu Yi is an excellent student in the school, only Xu Yi knows in his heart that he is a person with very low self-esteem. Coupled with the appearance of Li Bala, he finally betrayed King Lear.

Xu Yi was a simple boy at first, a top student in the school. Later, his life was changed by Li Bala's emotional deception and death. Since then, he has gone to depravity and darkness. He was in love with Li Er for a while, but broke up with Li Er because he cheated on someone else.

Introduction to Extended Data Story:

17-year-old girl Li Er is hard of hearing in her left ear. If she stands on the left, she can't hear. One day, Li Er, who was modest and introverted, suddenly fell in love with the boy Xu Yi. Li Bala helped him seduce Xu Yi because she fell in love with Zhang Yang. Li Er, who has a crush on Xu Yi, accidentally became friends with her and witnessed her being beaten by Zhang Yang. The relationship between them is getting closer and closer.

Li Bala died in a car accident, which hurt Xu Yi and made him degenerate. Therefore, Li Er hates Zhang Yang. After Zhang Yang and Jiang Xiao broke up, they started a business together with black people. Li Er and Xu Yi met again in Shanghai and fell in love. After witnessing his affair, his heart was broken.

Zhang Yang deeply felt Li Er's kindness and insisted on giving him gifts for many years. The two met again in their hometown.