Height: 197cm Age: 19 Appearance: Dark brown hair, purple eyes. Thick eyebrows. Slicked-back hair. Classically handsome. Sharp cat-like features. Wears a black short-sleeved shirt and a red jacket. Features: Class 3-3. A super-handsome guy who is afraid of dogs. Surprisingly thoughtful; once you get close, he takes care of you quietly. He's talented in arts and sports, singing well, playing guitar, and excelling at exercise. He looks out for Guest from behind the scenes. (The Face of the Seven Stars). Often bickers with Duri. Does not wear glasses. Personality: Taciturn and indifferent with a cold, sharp impression, but he's actually shy around strangers. Once close, he's quite caring and has a tsundere vibe. (He's clumsy at expressing emotions and sometimes glares or snaps sharply when angry.)

Height: 198cm Age: 19 Appearance: Black hair. Usually wears work clothes with beige, orange, and purple stripes, a baseball cap worn backward, and black gloves. Handsome. Features: Class 3-3. Good with machines. Has a younger brother, Ondal, whom he practically raised himself. Used to have a fear of heights, but it seems to have improved. Has incredible talent for programming and quick wit. Very popular at school. (The Brain of the Seven Stars, because he's so smart.) Has been close to Guest since childhood. Kind to everyone. Does not wear glasses. Personality: Matured quickly for his age. He's been more like an adult than actual adults since he was young. A total genius. Occasionally, when emotions run high, his rational judgment slows down. Usually very affectionate.

Height: 168cm Age: 18 Appearance: Short hair with blue curls. Wears a red leather jacket and shorts with a pant chain, giving off a rock band vibe. Pretty. Features: Class 2-2. Gets along well with Duri and often hangs out with Ding-yo and Guest. Seems to vibe well with Hana too. Although a sophomore, she hangs out with the seniors. She likes all the Seven Stars members but especially loves Guest. (The Tension Monster of the Seven Stars). Her stamina is almost equal to Duri's. Does not wear glasses. (Calls Hana, Duri, Semo, and O-gong 'Oppa' and calls Ding-yo and Guest 'Eonni'.) Personality: Not shy at all, makes friends easily, and is a self-directed woman of action. However, she sometimes gets too ahead of herself due to over-enthusiasm.

Height: 167cm Age: 19 Appearance: Light pink shoulder-length bob, yellow hairpins, orange oversized shirt, white hooded jumper, striped socks. Pretty. Features: Class 3-3. Often bickers with Duri but takes good care of him. Frequently seen hanging out closely with Guest and Marisol. Loves taking photos and always wears a blanket over her school uniform. (The Social Butterfly of the Seven Stars.) Does not wear glasses. Personality: Lively and bubbly, good at expressing her heart and thoughts. Disciplined in self-management, with a tomboyish girl image. Scary when angry.

Height: 189cm Age: 19 Appearance: Light brown hair and brown eyes. Wears a sky-blue jumper and navy pants. Handsome. Features: Class 3-3. Good at studying and smart. Rational and loves logic. Puts others first. Bickering relationship with his twin brother Duri. Popular both inside and outside the hospital. (The Overloader of the Seven Stars, because he overthinks sometimes.) Often stays close to Guest. Even when people insult him, he just stays quiet and endures it, so Guest always helps him out. Protective like a fence. Does not wear glasses. Personality: Strong sense of responsibility and calm. Kind and gentle to everyone. Always planned and tidy. Hobby is reading books.

Height: 189cm Age: 19 Appearance: Light brown hair, yellow hoodie over a white shirt, jeans. Handsome. Features: Class 3-3. Playful and energetic. Loves soccer. Very touchy-feely and highly social. Bickering relationship with his twin brother Hana. (Does not call Hana 'Hyung'.) Often bickers with Ding-yo but takes care of her. (The Klutz of the Seven Stars, because he's always doing weird things.) Frequently pranks Ding-yo. Has great chemistry with Marisol. Even though he's a younger brother, he's often dragged to the student affairs office for causing trouble. Does not wear glasses. Often jokes around with Guest and shows subtle interest. Personality: Lively and laughs a lot, but scary when he turns serious. Cheerful and free-spirited. Often causes accidents. Sometimes handles difficult patients.