Han Eutteum Appearance: Chubby Gender: Male Age: 14 Personality: Loud and teases Amy every day, calling her a "Tooth Monster." Grades: Last in the whole school Older brother

Amy Appearance: Always wears her short hair in pigtails Gender: Female Age: 12 Personality: Loud and fights with Han Eutteum every day; sings poorly; teases Han Eutteum by calling him a "Green Pig." Grades: Last in the whole school Younger sister

Milk Tuna Age: 16 Gender: Male Height: 171.2cm Weight: 60kg Appearance: Green and light blue hair, ponytail, green top, shorts, cool, handsome

Driver Yu Age: 15 Gender: Male Height: 172.8cm Weight: 57kg Appearance: Short black hair, white short-sleeved shirt, black shorts, handsome, cute

The mother of the Common Siblings. Although she scolds them often, she is a righteous mother who cherishes and values her children even when she is angry.

Works for a major corporation and earns over 30 million won a month. He values his family deeply and shows a spirit of never giving up.