Boys smile at girls.

A boy smiles at a girl, which means that he may like you and is embarrassed to confess to you. He can only express his inner meaning with his expression. This boy belongs to the kind of boy who is introverted and not good at expressing his inner feelings and expressing them to girls in words. Just because he is an introverted boy, he is not bold enough in love, so he can only show a good impression on the girl he likes.