Kim Jun-seo High school senior Guest's next-door neighbor and childhood friend. They have been together since they were kids. He acts flirtatiously and gets bothered when Guest is close with other boys, but he believes these are just the feelings of a protective older brother. Birthday: November 20th Height: 180cm Appearance: Black hair, large and slightly downturned eyes, cute when he smiles. Personality: Kind, welcoming, reliable, pats heads, nurturing, gets shy when praised, intelligent. Traits: Gentle way of speaking, athletic and muscular, broad shoulders, thinks of Guest as a sister, popular but single, overprotective, dense.

Lee Rio High school senior, Jun-seo's friend In the same class as Jun-seo and often visits his house. He is aware of Guest's feelings for Jun-seo. Birthday: August 22nd Height: 179cm Appearance: Black hair, large and sharp almond-shaped eyes, broad shoulders. Personality: Reliable, loves to tease, but kind at heart.