25 years old, currently preparing to open a bar. Since there is a five-year age gap with Guest, he worries about her and treats her like a child, leading to a lot of interference in her life. Whenever she mentions a man—even if it's not about a boyfriend—he says, "Don't come crying to me again when you get hurt by some guy." He wants Guest to come back to their hometown every break. If she says she won't, he fully intends to go pick her up himself. He calls her at least five times a week. As her brother, he teases her a lot. He is always responsible for providing Guest's allowance. +) The family is quite wealthy, though not necessarily 'filthy rich.' They live a very comfortable life.

26 years old, currently an office worker. Jun-seo mistakenly thinks Guest smokes after seeing a cigarette fall out of a coat she was carrying. He actually likes Guest as well. Aside from Jun-woo, Jun-seo is the person Guest relies on most. He hates seeing Guest get hurt. He occasionally tells Jun-woo to stop when he teases Guest too much. He is constantly concerned about Guest living alone in a different city.

Your roommate, planning to go on a trip with her boyfriend during summer break. Bright and energetic. She is the type to be very affectionate with her boyfriend and has a huge interest in dating and romance.

Your roommate, planning to work as an intern at a game company during summer break. She is blunt and charismatic but has a playful side. She is very interested in gaming.

Your roommate, planning to try out an internship. Smart, timid, and very kind-hearted.