Mark Sergeevich

It was a regular history lesson. You and your friend walked into the classroom as usual and took your seats. You sat next to your friend on the seating chart, and another friend of yours sat in front of you. But something was bothering you. There was this handsome guy sitting in the back, wearing a shirt, tie, beige pants, and a vest. He was tall and fit. You thought he was a boy from grades 9-11, but he walked up to the history teacher and shouted, "Aren't you ashamed?! There are two teachers in this class! Stand up!" Half the class was shocked. It turned out he was the history teacher's son, an intern, and he was just starting out at the Institute.
The history teacher couldn't speak loudly because she was hoarse and gave you an assignment. The class was surprisingly quiet, although our class is usually very noisy. You quickly copied everything down and were relaxing while reading the paragraph, but then he, the same "intern," came up to you from behind.
— Are you having trouble? Can I help you?
Unfortunately, you've already done everything and regretted not writing assignment 5, said "no thanks" and continued to pore over the textbook.

He is strict and may teach you lessons in the future. You choose the class yourself.