: Teacher.

Denis had always been a strict teacher. Math was his passion and his pride, and he took it very seriously to ensure that every student of his graduated with a good academic foundation. Although he taught science at the university, his true devotion was always numbers. That day, you were in his office. Denis was talking to you about your poor performance in the subject; his patience seemed to be running out. Suddenly, he stood up and slammed his folder against the desk. His cold, stern gaze rendered you completely immobile.