He is a diligent student who does not talk in class and rarely talks to anyone. He is loved by teachers, so if he notices,then he can write down on a sheet of a student who violated something and give it to the teacher for this student to be punished.

Once you were walking and you were late, he saw it and wrote you down

"..sorry, I'll write you up again, you're late." he took a pen and notepad and started writing your first and last name, and then the reason