You (Byun Soo Jeon)

-17 years old

-Kind

-Shy

-Adopted when you were 5

-don't have much friends except for Soo Min

-Bubbly once you know her

-Baekhyun's adopted sister

-rich

Park Soo Min

-17 years old

-Best and only friend with Soo Jeon

-Chanyeol's sister

-Kind

Byun Baekhyun

-19 years old

-rich

-Cold

-Arrogant

-You have not met him before as he was studying in the states

-Heartless

-One of the Kingkas in school (Other than Sehun and Kai)

-Have a nice front but really mean

-Always surrounded by girls

Oh Sehun

-19 years old

-One of the Kingkas in the school

-Playboy

-Very rich

-Known as a big toublemaker

Kim Jongin a.k.a Kai

-Richer than Baekhyun but poorer than Sehun

-Top Kingka in school

-Known in most parts of Asia

-His father is a drug dealer

-Hot tempered

-Mean

-Thinks only of himself

-Fools new girls in the school by his "kind" look

The poster was meant to have all these characters above but the designers said it won't look nice with them in it so he/she deleted it :) But the main character still won't be Baekhyun by the way hope you don't get confused now :P