Why did Lan Zhan bite Wei Ying?

Lan Zhan bit Wei Ying for the following reasons:

In the novel Father of the Magic Way, Lan Zhan bit Wei Ying, because Wei Ying said that Lan Zhan liked continuity and even left a scar to protect continuity. And because Wei Ying was angry with Lan Zhan on purpose before, saying that he didn't like men, and Lan Zhan was already in love with Wei Ying at that time, so later Lan Zhan became jealous and angry, and then he bit Wei Ying's arm hard.

Wei Ying 1:

Wei Ying, named Wuxian, was named the ancestor of Yiling. His father is Wei Changze and his mother is Tibetan, but when he was young, his parents were killed in night hunting. Unrestrained personality, possessing the magic weapon of flute and Yin.

2. Lan Zhan:

Lan Zhan, whose nicknames include two sons, Yi Zhi Gong Guang and Gu Sulan, is calm and unsmiling, and his appearance ranks second among aristocratic children. There are swords to avoid dust, and guqin to forget the machine.