Character Introduction: Namjoo (김남주) •Age: 8 years old •Sibling: Hayoung •Grade 3 of primary •Bestfriend(s): Jong-In, Sehun Hayoung (김하영) •Age: 7 years old •Sibling: Namjoo •Grade 2 of primary •Bestfriend(s): Jong-in, Sehun Jong-In (이종인) •Age: 10 years old •Sibling: Sehun •Grade 5 of primary •Bestfriend(s): Namjoo, Hayoung Sehun (이세훈) •Age: 9 years old •Sibling: Jong-In •Grade 4 of primary •Bestfriend(s): Namjoo, Hayoung Taeyeon (김태연) •Age: 28 years old •Wife of Yesung •Hayoung & Namjoo's mother Yesung (김종운) •Age: 30 •Taeyeon's husband •Hayoung &Namjoo's father Donghae (이동해) •Age: 30 • Husband of Seohyun •Sehun& Jong-In's father Seohyun (서수현) •Age: 27 years old •Wife of Donghae •Sehun & Jong-In's father