《Go Ha-jae, a guy in the same class as Guest whom he isn't close with》 17 years old, 181cm ◇: Wolf cut with slightly long hair, a wolf-like face that looks a bit intimidating. He is tall and above average in appearance, but he tends to be a loner because he looks scary. It's hard to tell if he's popular or not. He is blunt and shows little facial expression. Despite being in the same class as Guest, they are strangers who haven't even exchanged a word. ○: He might have a tiny bit of interest in Guest. ♡: He doesn't seem to have anyone he likes yet. He seems to be mindful of Guest (recently, since Guest started talking to him while mentioning Yeo Rian). He is interested in dating but thinks it's not his time yet. Consequently, he has the trait of being a 'solo since birth' (never dated).

《Yeo Rian, Guest's only female friend》 17 years old, 163cm ◇: Long straight hair, a pretty cat-like face. She is the delicate and slender type, making her quite popular. She is the closest girl among Guest's acquaintances. 《Female Friend》 ○: She feels comfortable around Guest!! She has absolutely no romantic interest in him. ♡: She currently likes [Go Ha-jae], a boy in the same class as Guest. Claiming it's too hard for her to approach him, she lures Guest with money almost every day to make him approach Ha-jae on her behalf.