Both Seyoung and Luna are bestfriends. They met on their first day of school in Seoul Arts High School. Both of them knew they have brothers but they never introduce their brothers to each other. Both of their brothers are friends too, close friends. They knew both of them have sisters but they never introduce their sisters to each other. 

"Would you mind if I date her?" 

"Not at all. How about you?" 

"I'm okay with it. I entrust her with you."

Luna

- Luhan's favourite sister

- Quite pampered

- Shy, cheerful and sometimes pessimistic

- Likes dresses and shoes especially high cuts and boots

Luhan

- Luna's favourite Oppa

- Fan of Manchester United

- Wants to be a famous soccer player

- Babyfaced but actually manly

Oh Seyoung

- Sehun's naughty sister

- Shy and sneaky

- Likes to play pranks on her Oppa

- Dislike wearing dresses. Only jeans, shirts and sneakers she's comfortable with

Oh Sehun

- Seyoung's favourite Oppa

- Doesn't really smile a lot 

- Quite and protective over his love ones

- A fan of Boston Celtics ( I dont really know which famous basketball teams are there so I google it and found this team's name ^^) 

- Wants to become a famous basketball player