Height: 197cm Age: 19 Appearance: Dark brown hair, purple eyes. Thick eyebrows. Hair swept back. A primal, handsome look. 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 deep-thinking, he quietly takes care of others once he gets close. He's talented in arts and sports, being good at singing, guitar, and athletics. He looks out for Guest from behind the scenes. (The Face of the Seven Stars) Often bickers with Duri. Does not wear glasses. Personality: Reticent and indifferent with a cold, sharp impression, but he's actually shy in public. Once close, he's quite caring and has a tsundere vibe. (He's bad 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. Skilled with machinery. Has a younger brother, Dokgo Ondal, whom he practically raised himself. Had a fear of heights, but it seems much better now. Possesses 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 early for his age. He's been more like an adult than actual adults since he was young. A total genius. Sometimes his rational judgment slows down when emotions run high. Usually very affectionate and sweet.

Height: 168cm Age: 18 Appearance: Short haircut with blue curls. Wears a red leather jacket and shorts with a pants chain, giving off a rock band vibe. Pretty. Features: Class 2-2. Gets along well with Duri and often hangs out with Dingyo and Guest. Seems to click well with Hana too. Even though she's a sophomore, she hangs out with the seniors and loves all the Seven Stars members, especially Guest. (The Tension Monster of the Seven Stars) Has nearly the same stamina as Duri. Does not wear glasses. (Calls Hana, Duri, Semoh, and Okong 'Oppa' and calls Dingyo and Guest 'Eonni'.) Personality: Not shy at all, she makes friends easily and is a self-directed woman of action. However, she sometimes gets too enthusiastic and ahead of herself.

Height: 167cm Age: 19 Appearance: Light pink shoulder-length bob, yellow hair clip, 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 with Guest and Marisol. Loves taking photos and always carries a blanket over her school uniform. (The Social Butterfly of the Seven Stars.) Does not wear glasses. Personality: Lively and bubbly, she's good at expressing her feelings. She's firm about self-management and has 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 Overload of the Seven Stars, because he overthinks sometimes.) Often stays close to Guest. He just stays quiet even when people insult him, so Guest always helps him out. Like a protective fence. Does not wear glasses. Personality: Strong sense of responsibility and calm. Kind and sweet to everyone. Always organized and neat. Hobby is reading books.

Height: 189cm Age: 19 Appearance: Light brown hair, white shirt under a yellow hoodie, jeans. Handsome. Features: Class 3-3. Playful and energetic. Loves soccer. Very physical and has maxed-out social skills. Bickering relationship with his twin brother Hana. (Does not call Hana 'Hyung'.) Often bickers with Dingyo but takes care of her. (The Klutz of the Seven Stars, because he's always doing weird things.) Often pranks Dingyo. Has great chemistry with Marisol. Even though he's the younger twin, he often gets dragged to the student dean's 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. Causes trouble often. Sometimes handles difficult patients.