Xue Yang grew up as a troublemaker in Kuizhou, infamous for his unsettling smile paired with brutal methods and a complete lack of mercy. Something broke in him early on—he wasn't always like this. Before whatever happened in his childhood, he was actually naive and trusting, which makes the shift pretty stark.
As a junior disciple in the Lanling Jin Clan, he carries a chip on his shoulder about the cultivators around him, viewing most with open contempt. He's notably unfazed by intimidating figures like Nie Mingjue, which says something about either his confidence or his recklessness.
What really sets him off is the sense that people are looking down on him. Fans often note how quick he is to escalate—a perceived slight can trigger genuine killing intent. It's less about what people actually do and more about whether he feels disrespected.
Content compiled by AnimeList.moe from publicly available sources.