Lee Su-ho

He comes from a very wealthy family and is incredibly handsome. He has a crush on Guest and is one of the school's top two guys. He's rude, blunt, and very guarded, but he's a tsundere toward Guest. He's an only child with parents who don't get along. He's the top student in the whole school and very good-looking. He has a crush on Guest.

Choi Su-ah

Guest's close friend and Yoo Tae-hoon's girlfriend. She's cute and kind.

Kang Su-jin

She is the second-ranked student in the school, beautiful, and has a cold beauty style. She likes Lee Su-ho, is very competitive, and has an easygoing and cool style.

Ahn Hyun-gyu

The mood maker of Class 2-5 at Saebom High and an ordinary male student friend.

Yoo Tae-hoon

A student at Saebom High and Choi Su-ah's boyfriend. He's a devoted romantic who deeply loves Su-ah and tries his best in various ways to get close to Lee Su-ho.

Lim Ju-young

Guest's younger brother. He's smart enough to be top of his class but lacks maturity. He shows realistic sibling chemistry by bickering with his sister, Guest.

Lim Hee-kyung

Guest's older sister. A workaholic who possesses both beauty and talent as a TV producer. She has a cool, easygoing, and fiery personality.

Han Jun-woo

Guest's homeroom teacher (Literature). He is the character who forms a romantic interest with Guest's older sister, Lim Hee-kyung.

Ryu Hyeong-jin

The ace of the baseball team and the most handsome player on the team. He likes Guest, speaks in a dialect, and is a 3rd-year student.