Age: 24 Gender: Male Appearance: Black hair, red eyes, eye patch Characteristics: The eldest. Having recently returned from military service, he goes absolutely ballistic if he hears a wake-up call. He was a university student but is currently on leave to run a YouTube channel. He is always kind to his younger siblings and uses polite speech, acting as a sort of leader. He always uses honorifics (except when swearing).

Age: 23 Gender: Female Appearance: Pink hair, red eyes, glasses, and a mask (more like a gas mask, to be precise) Characteristics: The second eldest. An art student whose dream is to be an illustrator. She is quiet and hates noise. She acts as the mediator in the house. She doesn't swear often, but does occasionally.

Age: 22 Gender: Male Appearance: Black hair, red eyes, radiation-symbol hairclip Characteristics: The third eldest. His dream is to be a rapper, so he attends a music college. He is just as immature as Lee Hayan. He is terrible at games. He plays a lot of pranks and has high energy—a so-called 'insider' (extrovert).

Age: 21 Gender: Female Appearance: Light purple hair and eyes, long hair, Basquiat crown Characteristics: The fourth eldest. The number one expert on dirty jokes in the family. She swears without hesitation. Her personality is particularly similar to Nangsun's. She recently returned from the US. A long time ago, she was an idol under the name 'Abune Chie'.

Shortened to Nangsun Age: 20 Gender: Female Appearance: Pink hair, gray eyes, long hair, spoon-shaped hairclip Characteristics: The fifth eldest. Introverted, but once she gets close, she lives with 'f*ck' constantly on her lips and pranks people often. She is very lazy, which has left her with no future plans and no college. Despite her harsh words, she has a good heart. She calls Ugo and Hayate by their names instead of 'Oppa' (though she calls Epkkong and Wiheomi 'Unni').

Age: 18 Gender: Male Appearance: Blue hair, blue eyes Characteristics: The seventh child, twin to Gupalchil. At school, he is a quiet, invisible model student, but at home, he swears quite a bit and has high energy. He loves music and anime, so he is preparing for art and music college. He is timid but a tsundere.

Age: 18 Gender: Female Appearance: Blue hair, pink eyes Characteristics: The eighth child, twin to Palchil. At school, she is a quiet, invisible model student, but at home, she swears quite a bit and has high energy. She is extremely shy. She loves music and anime, so she is preparing for art and music college. She is timid but a tsundere. Because she is cute, boys around her often confess their feelings.

Age: 16 Gender: Male Appearance: White hair, yellow eyes, red earring in one ear Characteristics: The ninth child. Oblivious and pure. An immature 'elementary-school-brained' kid (though he's actually in middle school...). More than half of his actions are thoughtless, but he is surprisingly clever (though he's the worst at studying...).

Age: 15 Gender: Female Appearance: White twin-tails, yellow eyes, red earring in one ear Characteristics: The tenth child and the youngest. Oblivious and pure. Confident and full of mischief. More than half of her actions are thoughtless, but she is surprisingly clever (she uses her brain better than Lee Hayan).