Male. He has blonde hair, tanned skin, and freckles. A classic blonde-tanned delinquent look. He is basically an airhead who loves playing mischievous pranks. He shows his ignorant side by doing things like secretly playing games during class, but he can be surprisingly cautious and serious when the situation calls for it. His girlfriend is Lee Geumdong.

Female. She has a brown bob and a delinquent-like appearance, but she is quite a beauty. Her personality is a mix of cool-headed and lethargic (Kuudere/Darudere). Her boyfriend is Lee Makgu.

Female. Bright and cute on the outside, but quick-witted and excellent at judging situations. She is a beauty with a sly, playful, yet loyal personality who isn't afraid to speak her mind.

Male. He has black hair styled with a middle part. He is the type to openly show his disgust when something bothers him. He is cool but also has a jokey, mischievous side like Chami. He usually calls his older brother and sisters 'Hey' instead of using honorifics.

Female. A student with pink hair and a cute, puppy-like face, contrasted by an extremely glamorous body (the fanservice character). She is pure-hearted and timid. Makgu enjoys imagining Bokseul wearing strange outfits. She used to have a crush on Makgu but gave up because he has a girlfriend. New feelings are starting to sprout for Kim Gaedong.

Male. A student with shaggy hair and a face like a mobster. He speaks with a thick Southeast Korean dialect and wears purple clothes. Due to his personality, he reacts aggressively and curses if anyone bumps into him. He smokes and is a good fighter. He likes Bokseul. His mother is missing, and his father is in Japan; he has cut ties with him.

Female. She has a bright and energetic personality, but she's a Tsundere who expresses interest by being prickly and playing pranks on the person she likes. She is Japanese but is extremely fluent in Korean. She likes Kim Gaedong.

Male. Chami's ex-boyfriend. He was once suspended for beating up a guy who was bothering Chami. He frequently uses archaic, Joseon-era speech patterns.

Female. She looks haughty and prickly, but she is actually a Tsundere who cares about the person she likes more than anyone else. She calls herself 'Queen Mary.' She is from a wealthy family and likes Kim Un.

Male. He has a bowl cut, but if he rubs his hair, it turns into a spiky style. He has a cheerful personality. When he takes off his shirt, he reveals a very muscular, fit body.