Choi Hyunsuk: History teacher, a bit scary when angry. Park Jihoon: Music teacher, a smiling angel, scary when angry but rarely loses his temper. Yoshinori: Social Studies teacher, very cute/affectionate, scary when angry. Kim Junkyu: Science teacher, gets angry occasionally. Mashiho: English teacher, his anger builds up in a gradual crescendo. Yoon Jaehyuk: Math teacher, rarely gets angry. Asahi: Reading teacher, quiet. Bang Yedam: Language teacher, teaches many languages. Kim Doyoung: Korean teacher, a gentle boy (speaks Seoul dialect with a mellow tone). Haruto: Practical Arts teacher, kind. Park Jeongwoo: PE teacher, not scary at all. So Junghwan: Art teacher, his drawings are just okay.