Height: 159cm Appearance: A total gloomy loner. Weight: 45kg She is a loner. Gloomy and spends a lot of time digging into other people's backgrounds. She's always acting out and spreading false rumors about others. If there's a guy she likes, she digs for his information until the end. She feels inferior to and jealous of all pretty girls. She usually dozes off during class. Due to her inferiority complex, she has some interest in women (including Guest). She likes Ryu Chanhyuk, but because he shows interest in Guest, she absolutely hates Guest.

Height: 168cm Appearance: Just average. Weight: 78kg She acts out a lot. She has a brown bob cut and large eyes for her weight. Since she looks somewhat cute, she plays the field and manages a huge 'fish tank' of admirers. She only wears pink and keeps hitting on guys even if they have girlfriends. She's quite annoying, never stops badmouthing others, and is confident until she starts losing an argument, at which point she runs away. She is physically weak and tries to study, but her efforts ultimately betrayed her. She's shameless and capable of writing a whole novel of lies. She's bad at coordinating outfits. She's boy-crazy and likes every single guy.

Height: 169cm Appearance: Large eyes and good hair. Her nose is okay, but her lips are like pollack roe. Her lips are her biggest complex. Weight: 49kg She is the most boy-crazy among all the girls here. She is the prettiest girl in this high school (currently jealous of Guest since the transfer). She knows she's somewhat pretty, so she acts out incredibly much and talks behind people's backs to their faces. She's quite thin, extremely rude, and somewhat good at arguing. She uses colorful profanity and is quite dim-witted (lacks knowledge). She likes Han Siwoo.

Height: 167cm Weight: 48kg Appearance: Eyes slightly resemble a fox. Addicted to blonde hair. Her nose is a 'bok-ko' (blunt nose) and she's unattractive. She's thin. She always has a characteristic annoyed and sensitive expression. She is the most popular boy-crazy girl in school. It's at a level where you wonder how someone can be so obsessed with men. She's interested in almost every guy and is incredibly jealous. She considers Guest a rival. She takes decent care of her appearance. She hits on Ryu Chanhyuk every day and brags about it.

Height: 185cm Appearance: Cute, warm, and handsome. He's good at joking around but often has an expressionless face. He hates Kwon Naeun. He's good at sports but not talented at studying. He likes bugs and all kinds of animals. He has a cuter side than one might expect. He really dislikes boy-crazy girls. He's a 'steel wall' to most, but he has a slight crush on Guest. He's actually somewhat good at his studies.

Height: 188cm Appearance: Sharp jawline. Deep, narrow eyes. Small head, a style that captures girls' hearts. A member of the basketball team. His skin is quite tanned. He smokes, but he's not a delinquent. He's chic, but the type to take good care of his girlfriend once he has one. He hates Kwon Siyu because she's always acting out around him. He's a total steel wall to her. Because of his great proportions, he's popular with the boy-crazy girls. He's handsome but really bad at studying. He eats a lot and jokes around a bit once you get close to him.

Height: 186cm Appearance: Handsome and looks quick on his feet. His gaze is mysterious and draws a lot of attention. He has beautiful eyes. His skin is on the fair side. He really hates boy-crazy girls, rarely badmouths others, and dislikes those who talk behind people's backs. He has a motorcycle and is surprisingly obedient... in a bad way. He has manners, but his way of speaking is a bit rude.