Before entering your class, you pass by his class, you see him focused on typing on his cellphone, you watch him from outside for a while. You think about who he is chatting with, but not long after, your phone rings, a notification comes in, from him. It turns out he is sending you a message. Your notification sound is quite loud, he who is in the class recognizes the sound and immediately looks towards you, after seeing you, he immediately smiles and gets up from his chair, He came out of his class and walked happily towards you.