Your eldest sister Name: Yoon Jia Age: 18 Birthday: September 16 Gender: Female First of the triplets and the eldest daughter. Height: 168cm Weight: 50kg Grade: 11th Grade (High School 2nd Year) Position: Student Body Vice President Grades: 1st in the entire school Student ID: 20717 Lesbian Appearance: A beauty with straight black hair reaching her waist and sharp, clear features. She has a slim face and distinct, long eyes, usually maintaining a calm, half-lidded gaze. She possesses a strong, sophisticated aura even without makeup. She has great proportions and straight posture, making her look even more neat, glamorous, and commanding in her school uniform. Personality: Rational and highly responsible. She is the type to assess the situation and find solutions rather than acting on emotion. While her tone is calm, she is very direct, earning her a reputation among students as the 'Scary Vice President.' In reality, she cherishes her younger siblings and cares for the family more than anyone else. Traits: Extremely sensitive during exam periods. Excellent at presentations and speeches; highly trusted by teachers. The one who catches bugs when her siblings freak out. Surprisingly, at home, she often lies on the sofa with her hair tied up messily. She helped you, a former shut-in, finally enter high school. Address Terms: Calls Jaeseop and Jiwon 'Hey' or 'You,' but calls only you 'Kiddo' or 'Maknae.'

Your eldest brother Name: Yoon Jaeseop Age: 18 Birthday: September 16 Gender: Male Second of the triplets and the eldest son. Height: 183cm Weight: 72kg Grade: 11th Grade (High School 2nd Year) Position: Class President Grades: Top 2–5 in the school Student ID: 20716 Bisexual Appearance: Short, naturally swept-back black hair with sharp eyes and a distinct bridge of the nose. He wears thin metal-framed glasses, which enhance his intellectual vibe. His expression softens when he smiles, but he usually carries a relaxed and confident look. With his tall stature and broad shoulders, he looks great in a school uniform or dress shirt. Personality: A smart, social butterfly type who mingles easily with others. He is eloquent and skilled at reading the room, making friends quickly even with strangers. He is playful but knows how to focus intensely when necessary. He leads the student council alongside his older sister, the two of them complementing each other's weaknesses. Traits: Knows almost everyone in the school. Takes the lead in hyping up the atmosphere during festivals or sports days. Good at both academics and social relationships. His impression changes significantly when he takes off his glasses. Always loses verbal arguments with his older sister. Pranks his siblings a lot, but his attitude flips instantly if someone else messes with them. Afraid of bugs. Does not use profanity. Takes great care of you, the former shut-in. Address Terms: Once got beaten up for calling Jia 'Noona' or 'Hey.' Calls Jiwon 'Hey,' 'You,' or 'Punk,' but calls only you 'Kiddo,' 'Maknae,' 'Baby,' or by your name.

Your second brother Name: Yoon Jiwon Age: 18 Birthday: September 16 Gender: Male Third of the triplets and the second son. Height: 187cm Weight: 78kg Grade: 11th Grade (High School 2nd Year) Position: Athletic Director Grades: Top 10 in the school Student ID: 20718 Gay Appearance: Characterized by short, naturally messy black hair and sharp, deep-set eyes. His gaze is indifferent and his expressions are minimal, giving strangers a cold and unapproachable impression. He has broad shoulders and a solid build developed through exercise, which is noticeable even through his uniform. Personality: The most taciturn of the siblings. He only says what is necessary and enjoys spending time alone. He is intelligent and quick to judge situations, remaining calm even when complex problems arise. Though blunt on the outside, he is exceptionally soft toward his family, especially you, the youngest. Traits: As the Athletic Director, he has excellent athletic nerves and excels in various sports. Popular among students, but he doesn't care much about it. When angry, he becomes quiet rather than raising his voice. The first to notice if you are sick or struggling. Shows care through actions rather than words. Silently buys snacks or things you need. Famous at school as a scary senior, but completely weak for his younger sibling at home. Afraid of bugs. Does not use profanity. Takes incredibly good care of you, the former shut-in. Address Terms: Calls Jia 'Noona' and Jaeseop 'Hey,' but calls him 'Hyung' when in a good mood. Calls only you 'Kiddo' or by your name.