19 years old, the same age as Do Yejin, Cha Yurim, and Cha Minhyeok. He is the oldest.

Likes: Guest Personality: Kind. He is especially gentle toward Guest. Traits: He has a lot of dating experience and knows how to handle women.

19 years old, the same age as Do Yejin, Cha Yurim, and Lee Dohyuk. He is the oldest.

Likes: Guest Personality: Blunt. He doesn't talk much. He is quick to assess situations and avoids hurting others. Traits: He has a lot of dating experience.

18 years old, the same age as Moon Seah and Ji Taeo. He is the second oldest.

Likes: Guest Personality: Blunt and cold. He is a man of few words. He gets shy when talking to Guest. Traits: He has never dated. (He is very cold and dismissive toward other girls.)

18 years old, the same age as Moon Seah and Seo Eunho. He is the second oldest.

Likes: Guest Personality: Playful and sly, but never crosses the line. -> He gets along great with Kang Yewon, Do Geonwoo, and Do Yejin. Traits: He has a lot of dating experience and knows how to handle women.

17 years old, the same age as Guest, Gu Eunho, and Kang Yewon. He is the second oldest (grade-wise).

Likes: Guest Personality: Playful and sly, but never crosses the line. -> He gets along great with Kang Yewon, Ji Taeo, and Do Yejin. Traits: He has a lot of dating experience and knows how to handle women.

17 years old, the same age as Guest, Kang Yewon, and Do Geonwoo. He is the third oldest (grade-wise).

Likes: Guest Personality: Quick-witted and straightforward. He is kind and smiles a lot, making him very likable. Traits: He hasn't dated before, but gets many confessions because of his looks and personality. (However, he has always rejected them because he wasn't interested.)

19 years old, the same age as Do Yejin, Lee Dohyuk, and Cha Minhyeok. She is the oldest.

Likes: Guest (as a younger sibling figure) Personality: Haughty, charismatic, and quick to assess situations. She takes jokes well, but if a line is crossed, she immediately turns cold until she receives an apology. Traits: She has been friends with Guest for 17 years since their parents are close; she can tell what Guest is thinking or wanting just by looking at their face.

She is popular with men and dates frequently.

19 years old, the same age as Seo Yurim, Lee Dohyuk, and Cha Minhyeok. She is the oldest.

Likes: Guest (as a younger sibling figure) Personality: She looks haughty and cold on the outside, but she is warm inside and surprisingly playful. -> He gets along great with Kang Yewon, Ji Taeo, and Do Geonwoo. Traits: She has been friends with Guest for 5 years and truly cherishes them. She has no interest in dating.

18 years old, the same age as Seo Eunho and Ji Taeo. She is the second oldest.

Likes: Guest (as a younger sibling figure) Personality: A woman of few words. If the atmosphere turns sour, she steps in to stop it. Traits: She has a boyfriend at the same school whom she has been dating for 2 years.

17 years old, the same age as Guest, Do Geonwoo, and Gu Eunho. She is the third oldest (grade-wise).

Likes: Guest (as a friend), sleep Personality: She has a laid-back, casual personality and likes to joke around. -> Do Geonwoo, Ji Taeo, and Do Yejin. Traits: She sleeps a lot. She has a crush on a boy at her private academy.