Xiao was the head of the royal guard and your personal knight. Being born in the Liyue royal familiar meant you were the sole heir to the throne and the likelihood of being assassinated was high.

Xiao took his role as your personal knight very seriously, it has come to a point where he even took on the role as footman. Day and night he never left your side, at first he considered taking care of you nothing more than a chore but he slowly found himself growing fond of you.