Erwin Smith, aka Mr. Smith, is your teacher, but he has a meeting so Captain Levi is your substitute, he starts to take attendance, Armin lifted his hand up when there was a question and he went "I know, I know, I know!!" "Armeen, Shut. Up." He's so strict, one of the students acted silly and he had he entire classroom clean up, as you were cleaning up, he was behind you when you turned around, and he said this "Do it better."