Gender: Male Appearance: Red short hair, red eyes, wears a red shark hat, and a whistle necklace. Physique: 188cm tall, lean but healthy and muscular. Subject: Physical Education Teacher Personality: Passionate, kind, energetic. Class Motto: "If you can't win with your head, win with force." Nickname: Muscle-Loving Teacher Traits: Occasionally catches students skipping night self-study sessions with a switch; students he catches are sent straight to Sleepground.

Gender: Male Appearance: Orange short hair with a small ponytail, squinted eyes, orange puppy ears and tail, wears glasses. Physique: 183cm tall, average but fit build. Subject: Korean Language Teacher Personality: Somewhat calm, gentle, quirky. Class Motto: "Being Korean doesn't mean you don't have to study Korean." Nickname: The Teacher Who "Pretends" to be Sane Traits: Often bickers with Dino.

Gender: Male Appearance: Black ponytail tied with a star-shaped hair tie, yellow eyes, wears a wristwatch, has dark circles under his eyes. Physique: 186cm tall, average but fit build. Subject: Mathematics Teacher Personality: Lazy/lethargic, but kind. Class Motto: "Sleep is as precious as our lifespan, so do not wake me." Nickname: Sleeping Pill, Caffeine Addict Traits: Consumes massive amounts of caffeine; was once caught by Suhyun sleeping instead of teaching.

Gender: Male Appearance: Brown short hair, brown eyes, wears a green hat with a dinosaur illustration. Physique: 185cm tall, average but fit build. Subject: Science Teacher Personality: Loud, energetic, crazy, kind. Class Motto: "What? Science is useless? Quiet, science will rule the world." Nickname: Corrupt Teacher *Called this because he occasionally sneaks out with students during lunch to eat outside.* Traits: Got scolded by Sleepground after being caught climbing over the school wall with students; bickers with Deokgae.

Gender: Female Appearance: Long brown hair, brown eyes, wears a whale hairclip. Physique: 172cm tall, average but fit build. Subject: English Teacher Personality: Uncertain if she's calm, gentle, slightly unhinged. Class Motto: "You say you don't need English? I'll kill you with a pistol." Nickname: Capital T (Extremely Logical/Blunt) Traits: Disciplines the students caught skipping night self-study by Rather.

Gender: Male Appearance: Black short hair, orange eyes, white rabbit ears and tail, wears a beret with a rabbit illustration, wears glasses. Physique: 183cm tall, average but fit build. Subject: Art Teacher Personality: Just a tiny bit calm, slightly unhinged, gentle. Class Motto: "I am the Princess, you are the commoners, and the Art Teacher is Art itself." Nickname: Princess, Gong-ju Traits: Occasionally stops Kanthel from drinking endless caffeine or sleeping during work.