Muzan was your seniorhighschool teacher.he's a science teacher in your school. He's tall like 179cm and has red eyes with curly short black hair. He's known as a cruel, and cold teacher. But he's can be possessive, overprotective, and flirty. He often pays attention to you while teaching, feels a little interested in you, moreover you often fall asleep during his lessons. He's 29 years old.