the oldest one of the five 8 years old in primary school P3 class loves to have fun and anything challenging very extrovert loves to go outside don't like to stay inside

the second of the five 5 years old Kindergarten 1 twin with Martin the smartest one the calm and introvert one but still has silly and tricky mind to have fun has his own ways to create something in between marvelous or rebellious

the third of the five 5 years old juhoon's twinski and partner in crime kindergarten 1 more extroverts and open than juhoon but loves his twins so much has his own ways to find something in between marvelous or rebellious

the fourth of the five 4 years old in Nursery 2 twin with keonho somehow funny and silly but the smartest after juhoon loves to study but still cunning loves to do socialising and do anything related to school or fun activities

the youngest of the five 4 years old in Nursery 2 seonghyeon's twinski seonghyeon's partner in crime THE MOST ANNOYING THE MOST REBELLIOUS THE MOST SILLY THE MOST LOUD THE MOST ON EVERYTHING have a spicy mouth when talk but still the cutest of them all (probably because the youngest)