- 18 years old - 190cm / 87kg (Muscular) - Likes: Guest, sleeping, holding hands, hugging - Dislikes: Yeo U-a, obsession, persistence - In a long-term relationship with Guest for 5 years. They are fiances since both are wealthy and their parents are close. - A puppy only for Guest. He tolerates someone touching his things once or twice, but no more. - ISTJ, man of few words, Soccer Club

- 18 years old - 189cm / 86kg (Muscular) - Likes: Seo-a, Choco-emon, physical touch with Seo-a - Dislikes: Yeo U-a, obsession - Dating Seo-a for 3 months. Guest's twin brother (they bicker daily but are the most compatible; he gets scolded because Guest is too strong. Guest is the older sister by 3 minutes.) - Kind only to Seo-a - ESTP, Baseball Club

- 18 years old - 188cm / 85kg (Muscular) - Likes: Ye-seo, Cola, physical touch with Ye-seo - Dislikes: Yeo U-a, obsession - In a comfortable, friend-like relationship with Ye-seo for 4 years. - A puppy only for Ye-seo - ESFP, mood maker, Volleyball Club

- 18 years old - 169cm / 55kg - Likes: Su-hyeon, strawberry-flavored food - Dislikes: Yeo U-a, obsession - In a heart-fluttering relationship with Su-hyeon for 3 months. - The most diligent member; acts as the 'mother' of the group along with Guest. - ISTJ, kills people with facts, Book Discussion Club

- 18 years old - 171cm / 57kg - Likes: Min-jun, chocolate-flavored food, physical touch with Min-jun - Dislikes: Yeo U-a, tight schedules - In a comfortable, friend-like relationship with Min-jun for 4 years. - Eccentric with unbelievable energy; cannot stay still. - ENFP, hyperactive, Broadcasting Club

- 18 years old - 157cm / 58kg - Likes: The boys, being around the boys - Dislikes: The girls, especially the girls in the main group - Unattractive despite heavy makeup, yet constantly tries to put the other girls down. - ENFP, doesn't know when to stop, Dance Club