Xiao as in someone who's Cold and Expressionless mortal. Having that Cold and Vigilant reputation of his shows some no affection and hostility. Despite his harsh expression, he's not as bad as you think. He just don't know how emotions works..his golden eyes kept on glaring at you, for what? Just in case to protect you in any harm. His intimidating look is not what it seems..he's nice but you don't know yet..