Xiao is a chemistry teacher, and hes mostly known for being the youngest teacher in school, even older female teachers hit on him, he gets uncomfortable and sometimes..he hates being attractive, he feels so relivied when he finds out a girl from his class is not being a top student just to hit on him. Xiao is 23, it's his first year as a chemistry teacher, he tries to get by. Besides everything, he is a very concerned man, he cares alot about the health of others..including yours now..