Bang Sun-hee (Sunny) Head of the female delinquents. Close with Challang-i and Kim Jang-mi. Has a crush on Kang Chan. Challang-i Nicknamed for her 'swaying' hair. Looks masculine. Calls Sun-hee 'Sunny'. Has a crush on Eom Seok-du. Kim Jang-mi Pretty appearance with a rose decoration on her hair and left chest. Speaks in a Busan dialect. Has a crush on Ma Hyeok. Ap Chun-ja Thick glasses and a pink pin. An anime otaku (loser type). Angela Jo Yi-seo 10 years later. A teacher. Currently a kind teacher (terrifying when angry). Prays often. Wears purple dress-like clothes. Kind and never gets angry (except at Iljin Girls' High students). Wang Jin-ju Green clothes, sharp eyes, heavy makeup, and hair rollers. Has a technique called 'Wang Jjajang Hand-pulled Noodles' where she grabs someone's hair and pummels them. Sun-hee's sworn older sister. Jang Nak-sun A total trash school inspector.

Jwi-bang-ul A klutz, close with Jo Yi-seo. A 'mistake' specialty student. Wears pink. Greets people by saying 'Bang-ha-ttari-ru'. Knows everyone. 17 years old. Jo Yi-seo Angela's past self as a delinquent specialty student. Hates Angela. Carries nunchucks. Wears a dark purple tee. 19 years old. Tough on the outside but soft on the inside. Can't eat spicy food. Close with Bang-ul. Kim Ddo-ra A 'weirdo' specialty student. A total nutcase. Always dancing (shouting 'Cha-cha-cha'). Mae Seok-du's rival. Wears mint-colored clothes. Dances with Grandma Kim Chun-rye after school. 17 years old. Mae Seok-du An acting specialty student. Wears orange, has chubby cheeks. Often fights with Ddo-ra. Wears glasses. His name means 'stone head' (idiot). 17 years old. Unlike Eom Seok-du, he makes himself understood. Ex: "Hey, Kim Ddo-ra, let go." or "Man, I've been starving for two days." Park PT An exercise specialty student. Extremely light. Yellow tee, white headband. Very awkward with Kim Nak-si. Calls Jo Yi-seo 'Master'. 17 years old. Kim Nak-si Black beanie, ugly, white headset, glasses. Black tee. Very awkward with PT. Has no close friends. 17 years old. Heo U-dae A 'consideration' specialty student(?). Handsome, glasses, tall. Something is off about his 'consideration' specialty. Mul-mi-yeok Homeroom teacher. Wears black sunglasses (never takes them off). Ugly (sorry). Blue hat, hair looks like seaweed. Ap-ja-bi's uncle. Ju-dung-i Wears glasses. Tries to make people laugh with dad jokes. The second teacher.

Ma Hyeok Male, red hair, bandage under his chin. Conquered Seoul with his fists. Cold personality. Likes Bang-ul. Handsome. Rival to Kang Chan. Kang Chan Blonde hair, thin glasses. Handsome, looks like a prince when reading. When angry, he destroys everything in sight. Likes Bang-ul. Rival to Ma Hyeok. Eom Seok-du Chubby cheeks. Gets furious if you touch his cheeks. Screams. Likes Bang-ul. Speaks in a way that's hard to understand. Ex: "Why are you guys doing that thing like that among yourselves?" Ap-ja-bi Possibly related to Ap Chun-ja? Wears sunglasses. Bowl cut. Always gets cut off when introducing himself. Kim Nak-sun Female, red ribbon pin. Pink dress. Likes Mul-mi-yeok. A teacher. Acts like a fox.