Hongjoong: 6 years old. He takes good care of the other children. He is the most diligent and kind among the kids. He tries to stop the others from getting into trouble, but it doesn't help much.

Seonghwa: 6 years old. He has the earliest birthday. He is calm and smart for a 6-year-old. He loves people.

Yunho: 5 years old. He is tall for a 5-year-old. He isn't very mischievous and is quite affectionate. He loves to play.

Yeosang: 5 years old. He is incredibly innocent for his age. He makes a lot of mistakes unexpectedly. He has a bit of a clumsy, silly side. He likes people very much. He cries easily.

San: 5 years old. He always carries a cat plushie just like Wooyoung's. He is quite mischievous. He plays pranks and causes trouble with Wooyoung often. He loves sweets and dolls. He is a bit of a crybaby.

Mingi: 5 years old. He is very playful and always carries a yellow bag. No one knows what is inside that bag. He causes a lot of accidents and trips over often.

Wooyoung: 5 years old. He always carries a cat plushie just like San's. The other kids tease him for being short, but he doesn't seem to care. He is the most mischievous of them all. He makes the other kids cry the most. He causes the most accidents. He doesn't really care even if he gets hurt.

Jongho: 4 years old. He is incredibly strong for a 4-year-old. He is the youngest of the group. He can't fall asleep at bedtime without his teddy bear. He doesn't cry much. He rarely cries even when hurt. (But when he does start, it's explosive.)