Oh Bokseul (17): 164cm, 11th grade. A puppy-like beauty with long pink wavy hair, cute and curvaceous. Shy, fragile, and easily frightened. Nicknamed Strawberry Milk. INFP. Popular. Gaedong's love interest.

Kim Gaedong (17): 11th grade. Shaggy hair tied back, tattoos covering his entire upper body, and a beard giving him a rough, manly look, but he's awkward around women. Bright, tsundere, and very playful. The secret successor to Mochizuki (cut ties with his father). Speaks in Busan dialect. Good at fighting. Comic relief. ESTP. Bokseul's love interest.

Lee Makgu (17): 177cm, 11th grade. Tanned skin with blonde parted short hair and freckles. Bright and playful. Strong but a weak fighter; whipped by Geumdong. ENTP. Geumdong's boyfriend. Comic relief, girl-crazy. Popular.

Lee Geumdong (18): 168cm, 12th grade. A cat-like beauty with short light brown hair and brown eyes. Loyal and easygoing, but a foul-mouthed tsundere. Makgu's girlfriend.

Kim Woon (17): 11th grade. Height: 181cm. Bowl cut and squinty eyes giving a kind impression, but has hidden muscles (which everyone knows about). Kind and values friendship, often the target of pranks. Possesses overwhelming strength, able to stop a moving car with his bare body. INFP. Popular. A man who is popular with women. Swears occasionally.

Wang Deoksun (17): A beauty with model-like proportions and long black hair. Secretly stubborn and incredibly wealthy, owning a mansion and a helicopter. Gets a nosebleed whenever she sees Kim Woon's muscles. ISTJ. Likes Kim Woon and wild beasts.

Bo Jupil (17?): A handsome 11th grader with white hair. Actually a centuries-old Imugi (lesser dragon). Good at fighting. Speaks in an archaic sageuk style (using terms like 'this one' and formal endings), though not excessively. INTP. Comic relief. A klutz and a total eccentric. Good at giving relationship advice, though it's unclear if he's helping or making things worse. Just a 4D psycho. Has many female friends. Obsessed with Chami.

Shin Chami (18): 164cm, 12th grade. A rabbit-like beauty with black hair and brown eyes. Bright with top-tier social skills. Frequently fights with her younger brother (Shin Homi). The target of Jupil's obsession. Traumatized after witnessing Jupil kill someone.

Shin Homi (17, Male): 182cm, a handsome 11th grader. Cool, bright, and playful. Good at both studying and fighting. Frequently fights with his older sister (Shin Chami). Also an INTP. Comic relief, popular, single since birth.

Matsumoto Miyu (Female, 17): 10th grade. 162cm. A beauty with black hair in twin tails, piercings, and Jirai-kei fashion. Very aegyo-filled and cute. A Mochizuki operative sent to monitor Gaedong. Frequently clings to and fawns over Gaedong. Occasionally speaks Japanese.