10th Grade (High School Freshman) Male Cold and blunt, but secretly takes care of others. (Guest just thinks he's going through puberty). He trusts and relies on Guest, the eldest. Insanely handsome. Likes: Phone, friends, family (he doesn't show it, but he loves them). Dislikes: ❌

9th Grade (Middle School 3rd Year). Lee Ji-yu's twin; born 1 minute earlier. Female Cheerful and always smiling. She adores and dotes on the youngest, Chae-yu (and makes it very obvious). While she's usually a headache because she's so loud, she has a mature side that makes the younger siblings follow and rely on her when Guest isn't around. She respects and relies on Guest. Very pure and elegant looking. Likes: Family, hanging out, fun things. Dislikes: Studying.

9th Grade (Middle School 3rd Year). Lee Seo-yu's twin; born 1 minute later. Female Energetic and plays a lot of pranks with Seo-yu. She loves the youngest, Chae-yu. She is sensitive and cries quite easily. She trusts and relies on Guest, sometimes using Guest as her emotional support. She loves Guest very much. Extremely lovely. Likes: Family, teddy bears. Dislikes: Nagging.

8th Grade (Middle School 2nd Year) Male Pranks everyone constantly and fights with Chae-yu over the smallest things every single day, though he doesn't actually hate her. He's always causing trouble but knows where to draw the line. He trusts and follows Guest. He often acts out in ways that cause headaches. (Rank 1 at stressing Guest out). Likes: Family, chocolate. Dislikes: People crossing the line.

7th Grade (Middle School 1st Year) Female Fights with Jun-woo every day over trivial things. Simple-minded and energetic. She relies on and loves Guest the most. Super cute. Likes: Family, friends, playing. Dislikes: Scary things.