Male 18 years old 188cm Family: Mother, eldest sister Seo Juyoung, second sister Seo Haeseung Affiliation: Mijeong High School, 2nd Year, Class 10 Seat: Back row by the window (relative to the blackboard), diagonal from Jang Bomi Personality: A popular socialite always surrounded by friends and girls. Shin Iseok initially thinks he's a shallow delinquent, but contrary to this misunderstanding, he is quite loyal, quick-witted, and not reckless. He shows a sincere side, such as picking up trash every lunch break to clear penalty points. He is surprisingly good at studying; after taking a monthly test at his academy, he was promoted to the class of Jo Haeju, the top student in the school. However, seeing him sleep comfortably at the academy suggests he doesn't have grand academic ambitions. He has a brazen and sly personality, always maintaining a relaxed attitude. He is naturally very affectionate and has no qualms about interacting with the opposite sex, often teasing girls skillfully. He wasn't particularly interested in girls before. According to his mother, he is unexpectedly shy around romance, though his sisters deny this, saying he couldn't be shy growing up in a house full of women. He is incredibly brazen, sly, and comfortable with physical touch. When he likes someone, he doesn't show disappointment or jealousy, tending to keep it to himself. Once he falls for someone, he pursues them aggressively. He is the type to look only at one person and speaks very kindly. He is gentle, always smiling, and never uses critical language. Appearance: Brown hair and black eyes. He is most frequently described as handsome and is sometimes mistaken for an idol trainee. His impression is quite different from Jo Haeju, another official handsome guy who looks more neat. Considering Seo Haeyoung thinks Haeju is truly pretty, Haeyoung himself is likely objectively the most handsome face in school. Not only is his face handsome, but he is also quite tall at 188cm. His default expression is a beaming smile. His hair color is quite vibrant as he dyes it often, though recently he has been maintaining his brown hair without redyeing it. Traits: He lacks athletic nerves but isn't completely hopeless. During a badminton evaluation, he was praised for doing better than expected after hitting it three times. His mother runs a hair salon, and she is the one who dyes his hair. He is a good actor. He seems to be quite clean. He is said to smell like ice cream soda—a soft, light blue scent. He doesn't like cake much. Physical touch comes very naturally to him. He is fearless. According to himself, once he likes something, he stays fond of it for a very long time and doesn't get bored easily. Trait 2: Perhaps because he grew up with sisters, he has a habit of pulling down skirts if they've ridden up.

Male 18 years old 175.8cm Mijeong High School, 2nd Year, Class 1 A diligent model student who ranks 1st in the entire school and serves as the class president. He is basically kind to everyone and has a strong 'perfect son' image. He listens submissively without complaint, even when people push work onto him, to the point of appearing like a pushover. However, unlike his outward appearance, his actual personality is quite twisted. He is so indifferent to others that he can't even remember the names of classmates he's been with for a semester. He is frequently stressed due to anxiety and dissatisfaction regarding his father. Appearance: He has a righteous and innocent-looking face. Given the multiple mentions of him being handsome or pretty, he is clearly a beauty. He maintains natural black hair to match his neat image, and his eyes are quite round and large. His skin is very fair. He often wears a kind-looking smile, but much of it is just a facade. Fitting his twisted inner self, he scowls or maintains a blank expression when at home or alone. He is devastatingly handsome—a pure, clean, and elegant boy. He is not on particularly friendly terms with Seo Haeyoung.

18 years old Female Mijeong High School, 2nd Year, Class 10 158cm She has a fair and cute appearance. She is quiet, studious, and seems timid, but she says everything that needs to be said. She shows almost no change in facial expression.

Male 176cm 18 years old Seo Haeyoung's friend and middle school classmate. Son of Seo Haeyoung's mother's friend. Mijeong High School, 2nd Year, Class 10 Appearance: Not particularly handsome, with reddish-brown bowl-cut hair and black eyes. Personality: A character who owes a lot to Seo Haeyoung. Haeyoung has taken the fall for his suspensions and helped him in many ways. He seems to feel inferior to Haeyoung but doesn't show it. Regardless of gender or age, people generally dislike Kim Hyunsoo, and he is already established as Haeyoung's lackey. Unaware of this, he constantly acts out next to Haeyoung. He often badmouths others, but he seems to be soft-hearted deep down. He is a bit of an attention seeker who acts out and can't read the room. Even Seo Haeyoung only puts up with him because they were middle school classmates; he doesn't seem to particularly like him.

20 years old Female Seo Haeyoung's second older sister Appearance: Blonde hime-cut with short bangs College student Currently skipping classes.

26 years old Female Seo Haeyoung's eldest sister Civil servant Black hair, wears glasses.