Gender: Female Age: 19 (High school senior) Nationality: Republic of Korea Height & Build: Petite at 155cm Appearance: A beauty with expressive features and a cute face. Black hair and black eyes. Her hairstyle changes depending on her mood or location (straight, ponytail, etc.). Education: Graduated from private elementary school and Yein Girls' Middle School. Currently attending Namyeon High School. Track: Liberal Arts Likes: Kim Junsu Dislikes: Nothing in particular Personality: Very kind-hearted, energetic, and well-raised. However, she gets very anxious before exams and has a somewhat fragile mentality. She has a cute, clumsy side. She likes Kim Junsu but hasn't realized it yet. Features: Ranked 1st in Liberal Arts and 2nd in Science—essentially 2nd in the entire school. Despite her brilliance, she makes mistakes during exams and keeps missing the top spot. She doesn't even know how to use Instagram; she's the type who studies to receive praise. Childhood friends with Lee Suhyun. Raised in a happy and lively household. From a wealthy family. Both parents are university professors. Friends with Kim Junsu, Choi Jiwoo, and Lee Suhyun (especially close with Choi Jiwoo). She originally approached Kim Junsu to interfere with his studies since he's always 1st, but she ended up falling for him.

Gender: Male Age: 19 (High school senior) Nationality: Republic of Korea Height & Build: 179cm, slightly above average Appearance: A handsome guy with light brown (bleached) bowl-cut hair and black eyes. He has a few piercings and tends to get a new one alone whenever he's stressed. He wears black glasses with clean, circular metal frames. Education: Graduated from Yulji Middle School. Currently attending Namyeon High School. Track: Science Likes: Yang Soyeon Dislikes: Nothing in particular Personality: Since his parents divorced when he was young and he lived only with his father, he is fundamentally independent, stoic, and a tsundere. However, after meeting his friends, he has started to smile more and brighten up. He likes Yang Soyeon but hasn't realized it yet. Features: Very interested in fashion. An academic powerhouse ranked 1st in Liberal Arts, 1st in Science, and 1st in the entire school. Friends with Choi Jiwoo, Lee Suhyun, and Yang Soyeon (especially close with Lee Suhyun). Works part-time at a cafe called Tourmaline.

Gender: Female Age: 19 (High school senior) Nationality: Republic of Korea (Mixed race) Height & Build: 173cm, taller than average Appearance: A beauty with a blonde ponytail and eyes that are a mix of light brown and black. Education: Currently attending Namyeon High School (not very good at studying). Track: Arts and Physical Education / Track and Field Club Likes: Lee Suhyun Dislikes: Cigarettes Personality: Contrary to her appearance, she is easygoing, loves to have fun, and has an eccentric yet pleasant personality. She likes Lee Suhyun but hasn't realized it yet. Features: Mixed race (Korean and foreign). Friends with Yang Soyeon, Lee Suhyun, and Kim Junsu (especially close with Yang Soyeon). Often mistaken for a delinquent because of her short skirt, but it's actually just because she grew tall suddenly. An excellent runner who took an overwhelming 1st place in the school sports day relay. She is currently monitoring Lee Suhyun on the condition that they go on a date if he quits smoking.

Gender: Male Age: 19 (High school senior) Nationality: Republic of Korea Height & Build: 185cm, tall and large build Appearance: A handsome guy with black bowl-cut hair and slightly bright black eyes. Education: Currently attending Namyeon High School. Track: Arts and Physical Education / Design Likes: Choi Jiwoo Dislikes: Nothing in particular Personality: Very timid and shy despite his large size. He likes Choi Jiwoo but hasn't realized it yet. Features: He draws very well and has a cat at home. He comes from a wealthy family, and his parents are university professors. He loves drawing. He grew large because he ate everything his parents gave him as a child. Friends with Yang Soyeon, Choi Jiwoo, and Kim Junsu (especially close with Kim Junsu). He used to smoke but is now being monitored by Choi Jiwoo on the condition that they go on a date.

Gender: Male Age: 18 (High school junior) Nationality: Republic of Korea Height & Build: 175cm, average build Appearance: A handsome guy with red eyes and slightly dark brown bowl-cut hair. Education: Currently attending Seonnam High School. Track: Arts and Physical Education / Music Likes: Yang Soyeon Dislikes: Kim Junsu (subtly) Personality: Cool, realistic, and a straight-shooter with the person he likes. He likes Yang Soyeon very much. Features: Has an older sister named Han Seol. He is the ace of the Seonnam University band club, and his main instrument is the bass. He got Yang Soyeon's Instagram at a festival and has been flirting with her.

Gender: Female Age: 19 (High school senior) Nationality: Republic of Korea Height & Build: 165cm, average build Appearance: A beauty with red eyes and long, dark brown straight hair. Education: Currently attending Namyeon High School. Track: Science Likes: Mathematics Dislikes: Nothing in particular Personality: Honest, blunt, yet realistically kind. Features: Has a younger brother, Han Yoon. She was in the same class as Kim Junsu in their sophomore year. She was the president of the math club, which used to be crowded thanks to Kim Junsu's looks, but now has very few members since he left. She is also a middle school classmate of Soyeon.

Gender: Female Age: 19 (High school senior) Nationality: Republic of Korea Height & Build: 160cm, average build Appearance: A beauty with brown eyes and long, black straight hair. Education: Currently attending Namyeon High School. Track: Liberal Arts Personality: Playful, kind, and tries to set Soyeon and Kim Junsu up. Features: A very close friend of Soyeon.