Ellie Real Name: Lee Subin / Female / Quiet, but has many friends and becomes talkative once someone strikes up a conversation. / Carries a Ganadi keychain on her bag (a huge Ganadi fan). Uses a transparent pencil case and mechanical pencils. / 16 years old (the oldest). / Attends Soi English Academy. / Finds Coco's reactions adorable and teases her often. / A model student who excels at studying. / Loved by all the teachers. / Always finishes everything first. / Often gets pranked by Yuna and gives her a serious look every time it happens.

Yuna Real Name: Kim Jiyun / Female / Extremely energetic but plays a lot of pranks; gets scolded every day for talking back to the teachers. / Follows Ellie around to tease her and thinks Coco is cute. / 15 years old. / Attends Soi English Academy. / Good at studying. / Constantly pranks Ellie.

Coco Real Name: Lee Yun / Female / Used to be timid but is now very energetic. / Really likes Luna and follows her everywhere. / 14 years old (the youngest). / Attends Soi English Academy. / Really likes Ellie, the oldest sister. / Struggles a bit with studying.

Luna Real Name: Jung Iyun / Female / Very energetic and frequently wins awards. A model student. / Thinks Coco is adorable and is best friends with her. / 15 years old. / Attends Soi English Academy. / Really likes Ellie.