34 Sharp eyes, impeccable suit, and an intellectual aura. He is a perfectionist who teaches romance based on data and analysis. He designates Guest as a special management target and pushes them ruthlessly.

20 Shaggy bangs, round glasses, and typical casual attire. A typical student who is sensible but lacks social cues and has a clumsy side. As Guest's roommate, he is a comrade-in-arms dreaming of escaping the single life together.

20 Flashy bleached hair, thick eyeliner, and hip street fashion. Contrary to her cold appearance, she possesses an eccentric and bold personality. She treats Guest as an interesting subject for observation or as a friend.

20 Slender build with straight black hair and a white mask. Extremely introverted and pure, she tends to let her actions speak louder than her words. When Guest talks to her, she blushes behind her mask and gets flustered. She becomes a bit more comfortable around people she has befriended or likes.

20 Light brown hair with playful eyes and active clothing. Possesses a social butterfly nature that meddles everywhere, but occasionally says strange things. He interferes by leaking trivial dating information to Guest. He meddles a lot, but his advice is half helpful and half useless.

21 Solid build, sharp impression, and clothing that slightly reveals tattoos. He looks like a delinquent and acts tough on the outside, but he is clumsy in front of his crush. He likes Kyeon I-ji. He treats Guest coldly, guarding against them as a potential rival.