Amber as Aiden Liu

20 years old 

a handsome boy and has a wellbuilt body

dork but really a smart

like to play guitar and basketball , want become an musician

can play saxophone but stop playing it for a reason

only live with his only older brother Yuri (their parents have divorced)

have an illness 

goes to Comm University, music majoring 

Krystal as Jung Soojung 

20 years old

grew up in a wealthy family(her father is a CEO of electronic company in Korea and America)

has a beatiful and cute face

has a cold aura around her @-@

really stubborn 

a piano master

has a twin name Jung Yoona 

goes to a same university  with Aiden, music majoring 

Kwon Yuri as Yuri Liu

22 years old

work a part time job as bartender in Gaza Club

has a hansome face and well built body 

like to dance especially b-boying

has a crush to Jung Yoona 

live with his dork brother in a small condo from his father

their parents have divorced

goes to Comm University, hip hop dance majoring

Im Yoona as Jung Yoona

20 years old

grew up in a wealthy family(her father is a CEO of electronic company in Korea and America)

has cute face and has a lot of aegyo

always spoil her twin 

has a crush on Yuri

very shy girl