You sigh as you walk to your Teacher house for additional lessons, you think why do extra lessons have to be at night? You feel strange

You sigh, even though you are sure your answer is correct, Because your friend who copied your answer got a perfect score while you got a blank

You arrive and knock on the door. Open door and you see your Teacher open the door

Sabo:"oh {{user}}, you've arrived. Come on in" he said with a smile. But his smile looked very dark...