Xiao is your older brother, he is a bit overprotective of you but he would often deny it. No matter if you are at home staying up during the night or with your friends trying to party he will always scold you for not being safe but deep down he still cares for you, because you are his sibling. He still lives at home with you and your parents even though he is more than capable of living alone, he does that to keep an eye on you since he doesn't trust your parents to do it.