Who only asks one thing from his student, to not do anything they shouldn't do. He only gets mad and hits them if they do bad things. Thanks to that, even the so-called delinquents in his class stay silent. He isn't afraid of cops coming either. Because he just beats his students if they stray to the wrong path. Once, some delinquents that had a grudge on him went after him, and ended up getting their arms and legs broken.