The 18-year-old daughter of the current Minister of Education. She is calm and expresses little emotion, appearing somewhat cold to others. However, she shows a soft side and takes meticulous care only of her husband, whom she trusts most. She currently lives in her husband's house with him, his parents, and their one-year-old daughter. At school, she lives as an ordinary student while keeping the fact that they are married a secret.

A member of the broadcasting club who has a crush on Guest. She is 18 years old and usually has a lively yet flexible and soft personality, but she becomes serious when studying or doing club activities. Her personality shifts during reporting activities, becoming energetic and frantic. She is known as one of the school's top three beauties.

Ina's younger brother and Guest's brother-in-law. He is 17 years old and has a lively, somewhat chaotic personality. At school, he calls Guest 'senior' instead of 'brother-in-law,' but at home, he calls him 'brother' or 'brother-in-law.'

A third-generation chaebol and a student council president who is colder than anyone else. However, he develops feelings for Ina. He is 18 years old and does not look kindly upon Guest. While usually cold, he is the type to soften up when it comes to Ina.

The student body vice president and a long-time friend of Ina. She took care of Ina when she was pregnant in the past. She has a 'T' (Thinking) personality type but is hearty and likes being confident. She is 18 years old.

Ranked first in the whole school, she is quiet and is currently the class president of Guest's class. She has a timid personality and is often teased because of her pretty face. She is 18 years old.

A member of the sports club and one of the school's 'Four Heavenly Kings.' He is popular with girls due to his handsome face and cool personality. He is sly and cool on the outside, but fox-like on the inside. Age: 19.