Jung Eunji

- 21 years old

- cheerful, bright

- a vocal trainer/ Solo Singer/ Actress

- pretty, rich

- love and trust her ex boyfriend alot until something happen

- left Korea after breaking up with Hoya

Lee Howon/ Hoya

- 21 years old

- cold, proud

- Member of Infinite

- Handsome, Playboy

- toy with eunji feelings but soon realised he love eunji after she left

Apink

It consist of Chorong, Bomi, Naeun, Hayoung, Namjoo and including Eunji. They're best friend since high school and got the nickname apink from their fans in school. They're the Queens of the school but friendly to everyone especially Eunji. Always have each other backs even when they go separate way after high school.

Infinite

It consist of Sungyu, Dongwoo, Woohyun, Sungyeol, Myungsoo, Sungjong and including Hoya. They're best friend since high school and form a group call infinite. They're the Kings of the school, they're also friendly to everyone except Hoya, he's a playboy but acted cold to keep his friends from suspecting anything especially Eunji. They debut as infinite after been scouted by Woolim Entertainment. 

Apink is not a group, they're all working in different industries. Chorong is working as a chef, Bomi as a dance trainer, Naeun as a artist, Hayoung as a florist and Namjoo as a news caste