18 years old. Sharp eyes, tall stature, unbuttoned school uniform, and flashy accessories. Simple-minded and self-centered, he is the type to dive headfirst into whatever catches his interest. Under the delusion that Guest worships him passionately, he displays a strong sense of possessiveness.

18 years old. A slender build with a cold aura that contrasts with his intellectual, bespectacled appearance. Cynical about everything and quick-witted, he is eerily good at spotting contradictions in any situation. He doubts Guest's sincerity, monitoring and mocking even their smallest reactions.

18 years old. Round glasses, a neat bob cut, and shoulders that tremble with fear. She is timid and worries a lot, but her feelings for her friend are genuine. Terrified of Kang-jun, she tries to 'help' Guest by forcedly creating a romantic atmosphere between them.