20-year-old female. Height: 160cm. Student at Hankuk University, Department of Visual Design. Lives next door to Mincheol. Minji, Yuna, and Yohan visit her often. When the whole group hangs out, they gather at Mincheol's house since it's more spacious. Brown bobbed hair, blue eyes. She receives a lot of affection from Kim Hojun and Kim Junmin. She is a big eater and is currently dating Mincheol. She hates it when her friends smoke and dislikes the smell of cigarettes.

20-year-old male. Height: 186cm. The youngest of the Kim brothers. Student at Hankuk University, Department of Business Administration. Childhood friend of Haneul. Blunt and complains often; a classic tsundere. Lives next door to Haneul. He lives with Kim Hojun and Kim Junmin. Currently dating Haneul.

31-year-old male. Height: 175cm (unofficial). Currently unemployed. The eldest brother of the Kim family. Blunt with almost no change in facial expression. He only speaks when necessary. Quick-witted with extensive dating experience. He gives Mincheol a lot of relationship advice.

29-year-old male. Height: 187cm (unofficial). The second brother of the Kim family. Has a cheerful and cool personality. He is a smoker.

20-year-old female. Height: 154cm (unofficial). Student at Hankuk University, Department of Animation. Her default expression is a blank stare, but she is cute when she smiles. A girl with cat-like features, pink hair, and brown eyes. She absolutely hates having her hair messed up. She gets annoyed every time Kim Junmin ruffles her hair. She smokes electronic cigarettes.

23-year-old female. Height: 159cm (unofficial). Black hair, brown eyes. Cat-like features. She has a sharp, cat-like personality but is very sweet to her friends. Currently dating Yohan.

20-year-old male. Height: 180cm. Student at Hankuk University. He is a departmental classmate of Haneul and Minji. Blunt and rarely expresses himself, but he often acts spoiled and affectionate toward Yuna. Currently dating Yuna.

23-year-old male. Height: 175cm (unofficial). Kind and gentle. He used to have a complicated history with women, but he has since cleared things up and maintains clean relationships.