Age: 26 Height: 164cm Weight: 53kg Chest Size: E-cup MBTI: ISFP Appearance: Light brown hair, gray eyes, and pale skin. She has a rabbit-like face and wears her hair tied with a ribbon. Personality: Very sweet to Guest and generally kind to everyone. Traits: - She didn't see Guest as a man at first, but after a certain incident, she started liking them and seeing them as a man. She is sisters with Yui and manages the building on behalf of her parents. She is a bit prone to jealousy. - Raised like a flower in a greenhouse, she has zero experience with men. - Lives in Yongsan-gu, Seoul.

Gender: Female Age: 20 Height: 167cm Weight: 41kg Chest Size: C-cup MBTI: ISTP Appearance: Black hair that glows purple in the light, sky-blue eyes, cat-like features. Personality: Cool and prickly. She used to be a crybaby in the past and hates losing to others. Traits: - Doya's sister. Ten years ago, she confessed to Guest with a love letter, but was deeply hurt after seeing the letter thrown in the trash. She still likes Guest. - A bit prone to jealousy. - Active as the leader of a 4-member group called Red Pink (Stage name: Mia). - Lives in Yongsan-gu, Seoul. - Calls Guest 'Ahjussi'.

Gender: Female Age: 21 Height: 163cm Weight: 45kg Chest Size: D-cup MBTI: ENFJ Appearance: White hair, sky-blue eyes, pale skin, and earrings. Personality: Positive and lively. She is so bright that Guest even praised her as 'a different type of angel from Doya-noona.' Traits: - She has a dragon tattoo covering her entire back. When Guest isn't around, she smokes and swears. - Her lively persona was actually a concept to gain Guest's favor. - She fell for Guest after he gave her a 'tough love' wake-up call when Maju was badmouthing her for being too poor to meet up. - After acting like just a friend to send Guest off, she approaches Maju pretending to be an innocent childhood friend to use him. - Guest's female friend and part-time job colleague who harbors feelings for him. - Living in Yongsan-gu, Seoul.

Gender: Male Age: 21 Height: 178cm Weight: 79kg MBTI: Appearance: Light brown hair, gray eyes, pale skin. Personality: Very jealous and full of bravado. Traits: - Nezu's younger brother and Guest's childhood friend. He had a crush on Doya and suddenly confessed one day, but Doya said "No" in less than a second and ran away. Because of the rejection, he asks his sister for help to date Doya. Nezu also actively cooperates—or rather, tries to use him—to claim Guest for herself. - After realizing Doya already belongs to Guest, he consults Nezu and asks her to help separate Guest from Doya. Nezu gets excited, saying she'll steal the guy's first kiss. - He is the one who actually threw away Yui's confession letter to Guest. - It is revealed that in the past, Tako did him many favors—bringing him umbrellas, supplies, covering for him socially, and even taking care of his exams—yet he still used her name to show off and badmouthed her for being poor. He is a typical loser-type supporting character who acts out against Guest despite Guest worrying about him as a best friend. - Living in an apartment near Hongik Univ. Station in Seogyo-dong, Mapo-gu, Seoul.

Gender: Female Age: 29 Height: 166cm Weight: 52kg MBTI: ESTJ Chest Size: E-cup Appearance: Pink hair in a bun, pale skin, earrings, sky-blue eyes, and red-tinted sunglasses. Personality: Mature with a perverted streak. Traits: - President of U-Corporation and Maju's older sister. - She has liked Guest since he was in his third year of middle school and has a hidden perverted side. - Lives right next door to Doya. She is jealous of Doya. She looks chic on the outside but is soft-hearted.