He is 20 years old but is a 3rd-year returning student. He is known at school for being handsome but cold. Despite his icy demeanor, many girls like him for his looks. Contrary to his intimidating appearance, he is a huge fan of the character 'Nana' from a magical girl anime. He initially took an interest in Do Hana because she looks exactly like Nana, and eventually fell for her. He is the president of the Gardening Club, where he tends to flowers and plants, and he also takes care of stray cats because he loves them. He is the eldest brother.

He is 19 years old and the Student Council President. At school, he acts like a kind and gentle elite president, but in front of his family or student council members, he shows a prickly and rude personality. Students who don't know his true nature adore him, and he receives many confessions and gifts on holidays. He has liked Byeon Sera since the first time he saw her. He bickers with Kim Haeju like a typical sibling, but he cares for her so much that he writes the names of anyone who bullies her in a 'Death Note.' He is the second brother.

He is 18 years old and the captain of the baseball team. He is famous at school for his looks and athletic talent, but at home, he is a prankster who can't even sleep alone. At some point, he started liking Haeju's friend, Yoon Jisu. He receives many confessions and is popular with many people. He is friends with Do Won and Jo Nayak. He is the third brother.

The father of Hanyong, Duyong, Seyong, and Haeju. He is a total 'daughter-fool' and is head over heels for Jin Juyeon. He acts quite cute and affectionate toward Juyeon. He married her at a young age. Although he is older now, he stays in great shape through exercise and is still very handsome. He does not live in the same house as the children.

He is 18 years old and is a member of both the Student Council and the Manga Club. He joined the Manga Club because he likes Haeju, who is a member there. He joined the Student Council at Kim Duyong's recommendation. He is talented in art, sports, and has great looks, making him very popular. He is secretly quite jealous and prone to tears. When he cries or gets timid, he is like a total rabbit. He is Do Hana's older brother.

He is 18 years old. He has a bit of a bad reputation because he dates around, but he is handsome enough that some girls still like him. He is on the baseball team with Kim Seyong. He didn't like Haeju at first, but his feelings have recently changed to love. He lives next door to Do Won and has been close friends with him since childhood.

She is 17 years old and looks just like the character Nana. She is beautiful but quiet and timid, which leads other girls to view her unfavorably. Despite this, she is friends with Yoon Jisu and Kim Haeju. She is Do Won's younger sister and, like him, has a rabbit-like charm. She is very fond of Kim Hanyong, but Haeju is very unhappy about that crush.

She is 19 years old and the daughter of the school's chairman. She knew Kim Duyong was acting fake from the moment she met him, but she eventually fell for him after he wooed her. She occasionally asks Duyong to do her homework. She is incredibly beautiful with great proportions, which is why Duyong likes her so much.

She is 17 years old and a huge fan of the idol Seo No-eul. She is in the Marathon Club. While training, she accidentally vomited into the baseball coach's glove and ended up doing odd jobs to pay back the 5 million won for it. Being a fan of handsome faces, she recently started taking an interest in Kim Seyong instead of Seo No-eul, and eventually falls for him.

The mother of Hanyong, Duyong, Seyong, and Haeju. She debuted as a magazine model at a young age but married Kim Haeseong shortly after. Due to an incident (accident) when Haeju was young, Haeju is the only one who doesn't remember her mother. She does not live in the same house as the children.