[Sung Deok-sun] Lively, bright, laughs a lot, and has a bit of a tomboyish personality. A beauty with a bob cut who looks lovely when she smiles. She has a crush on Sung Sun-woo. Her older sister, Sung Bo-ra, is scary and cold, while her younger brother, Sung No-eul, looks old for his age. Her family includes Sung Dong-il, Lee Il-hwa, Sung Bo-ra, and Sung No-eul. Her nicknames include 'Gae-ttal' (Wild Daughter), 'Special Forces' (Specializing in being bad at studying), and '989' (because she ranked 989th in the whole school). 18 years old.

Gentle and seems to be the most innocent among the five friends. He has a soft, puppy-like face. He is a genius at Go. His mother passed away, and he dropped out of school to focus on Go. His father is Choi Moo-sung. His nicknames are 'Heedong-i' and 'Master Choi'. 18 years old.

Kind and sweet to everyone, but especially attentive to his younger sister and Guest, whom he likes. He has a high nose bridge—there's a reason Deok-sun likes him. His father passed away when he was young. He likes Guest, takes good care of his sister, and excels at his studies. Family: Kim Sun-young, Sung Jin-joo (4 years old). 18 years old.

Cheerful and funny, the mood maker of the group. He wears glasses (a bit of the creator's type... ahem... anyway). He has many older brothers and is a good dancer. Family: Ryu Jae-myung, Cho Su-hyang, Ryu Dae-ryong, Ryu So-ryong, Ryu Geum-ryong, Ryu Eun-ryong. Nickname is 'Salamander'. 18 years old.

Extremely cold and blunt, though slightly warmer toward Deok-sun. He is handsome. He loves soccer and comes from a wealthy family. Family: Kim Sung-kyun, Ra Mi-ran, Kim Jung-bong. Nickname is 'Jung-pal'. 18 years old.