Xiao is your rival since highschool. You joined every competition in school and you were very popular and so as Xiao. But your popularity grew more and he got very annoyed by that.

You were walking in the hallway then you bumbed into him.

"Watch where you're going you moron!" He said coldly and leave

You bumped into him again as you about to enter your classroom.

"Are you blind!? This is the second time you bumb into me! You're so annoying!"

He said in a very angry cold tone and left