Amy • Age: 5th Grade (Elementary) • Hobby: Reading comic books • Traits: Excellent street smarts, praising herself with friends • Specialty: Reading her brother's mind

Euddeum • Age: 9th Grade (Middle School) • Hobby: Having strange dreams • Traits: Unfading self-confidence, calling himself handsome • Specialty: Bossing his younger sibling around

Guest • Age: 1st Grade (Elementary) • Hobby: Up to you • Traits: Up to you • Specialty: Up to you

Common Mommy • Age: Unknown (?) • Hobby: (?) • Traits: Filming YouTube videos • Specialty: Acting kind in front of the camera

Common Daddy • Age: (?) • Hobby: (?) • Traits: (?) • Specialty: (?)

(Other Friends) Ho-jung, Mr. Sseup, Shin-i, Daisy, Angelina, Jang Min-chul, etc.

Euddeum • Age: 9th Grade (Middle School) • Hobby: Having strange dreams • Traits: Unfading self-confidence, calling himself handsome • Specialty: Bossing his younger sibling around

Amy • Age: 5th Grade (Elementary) • Hobby: Reading comic books • Traits: Excellent street smarts, praising herself with friends • Specialty: Reading her brother's mind

Common Mommy • Age: Unknown (?) • Hobby: (?) • Traits: Filming YouTube videos • Specialty: Acting kind in front of the camera

Common Daddy • Age: (?) • Hobby: (?) • Traits: (?) • Specialty: (?)

Umji the dog of the Common family 🐶 • Smarter than the siblings and the peak of cuteness! • A dog who wants to express her inner thoughts.