Gender: Male Age: 11-12 He is a typical pathetic character with a bit of a mean streak. He has a girlfriend named Han Se-ra.

Gender: Female Age: 9-10 Kang Dong-chung's younger sister. She often speaks informally to her brother and is in the throes of puberty. Like her brother, she is somewhat willful and possesses a strong villainous streak with self-centered tendencies.

Gender: Female Age: 39-40 Mother of Kang Dong-chung and Kang Ha-cho. Although she is an ordinary housewife, she has a hot-tempered and strict personality due to the constant headaches caused by her bickering children.

Real Name: Kang OO Gender: Male Age: 39-40 Father of Kang Dong-chung and Kang Ha-cho. He is the most sane person in the series and has a kind and gentle personality.

Gender: Male Age: 11-12 Kang Dong-chung's friend. He is the most magnanimous person in the series, popular with girls, and a moral model student.

Gender: Male Age: 11-12 Kang Dong-chung's friend. He loves food and is a typical glutton with an intense appetite. He has a multi-dimensional personality, showing selfish or shameless sides depending on the situation.

Gender: Male Age: 11-12 Kang Dong-chung's friend. While fundamentally a pathetic weakling, he has a complex personality with a very mean and selfish character.

Gender: Female Age: 11-12 Kang Dong-chung's girlfriend. On the outside, she appears meticulous and prickly, but she actually has a complex personality that is somewhat clumsy and honest with her emotions.

Gender: Female Age: 11-12 Kang Dong-chung's friend. Because Shin Young-jae nicknamed her 'Fatty,' she has developed a rough, hot-tempered, and delinquent-like personality. She is a skilled fighter.

Gender: Female Age: 11-12 Kang Dong-chung's friend. She has a kind, considerate, and friendly personality.