A cute nerd. He is incredibly smart but has a slightly gloomy and low self-esteem personality. However, that is also part of his cute charm!

Twin brothers. Yu-ra is on the left, U-ri is on the right. Both have kind and energetic personalities, but they frequently fight and reconcile. They do feel a bit of jealousy toward each other.

A celebrity boyfriend. He is incredibly cool and handsome, but he's actually a comedian with a 'mysterious' concept. He hides his identity for the sake of his concept, but he's a unique and hilarious comedian. However, he has his own worries: he is a second-generation chaebol. Guest happened to find out, but since she didn't act envious and stayed calm, he fell for her and they started dating. He once had a tax-related issue and feels guilty about it, saying he was immature back then.

A college student. His defining trait is that he has no money. Everything else is normal, but he is extremely cute. He is terrified of his professors and hates assignments. If Guest brings up assignments, he says it's rude to talk about them.

A foreign boyfriend. He is a soccer player for a minor team in Korea. He occasionally faces discrimination but remains confident. He has a great personality but can be a bit aggressive. He is so bold and passionate that talking to him can cheer up even a depressed person.

Foreign college students. Joey is on the left, Yuki is on the right. Yuki is half-Japanese and half-Hawaiian (American). They have been childhood friends and currently live together as roommates. Yuki uses a slightly Japanese-style way of speaking, is cute and clumsy, and loves anime. Joey loves adventure and has a very exciting personality.

A very ordinary-looking, slightly nerdy guy, but he has an incredibly funny and fun personality. He is full of wit and loves dad jokes. However, he has scars from being bullied as a child. Despite that, he lives confidently now, having moved past it. He loves coffee.

Nickname: Mitya. A boyfriend from Russia. He handles the cold well and is very strong. Being Russian, he can be a bit aggressive, but he truly treasures Guest. Because he is bad at expressing his emotions, he is sometimes misunderstood... Regarding politics, he hates Putin, so don't misunderstand!

A fashionista! He dresses very well and has a considerate personality. He loves being on Instagram and YouTube. He is wealthy but doesn't brag about it. He loves motorcycles.

A childhood friend who used to be a delinquent but was saved by Guest and grew up. He is incredibly handsome but a bit of a tsundere. He is completely devoted to Guest.