Byun Sae Mi/Sammy  (16) : 

Or otherwise known as the famous 'dongsaeng' of Byun Baekyun, the go-to guy in Cheongdam Academy. Although they had separated and she had left with her mother to the States when their parents divorced, the school immediately became hectic upon the news of her return. Partly because she was praised by her brother to be sweet and gentle, basically the ideal girl of every guy's dream. But really... you never know. 

Wu Yi Fan/Kris (17) :

If you shout 'Kris', just basically anywhere around the school building, most likely you'll get shot back with the word 'Duizhang'--loud enough you'll probably remember it for the rest of your life--since he's most likely known as the school's captain of the basketball team, or in other cases, the Knight on a white horse. 

Jung Daehyun (16) :

The sweet, and outgoing guy who moved from Busan at the beginning of the year and easily became a part of B.A.P, one of the school's popular group. 

OTHER CHARACTERS :

Byun Baekhyun (17) : 

The go-to guy in Cheongdam Academy. Or in Sae Mi's case, the dorkiest and most annoying brother who'd do the infamous light-switch dance, just to embarass her infront of her friends. 

B.A.P (Best, Absolute, Perfect) : 

One of Cheongdam Academy's popular group consisted of 6 guys, who made life seemed like a Fairytale with their handsome figures, breath-taking smiles, and absolute perfections. 

Baka-chan's Note : I do not own any of the pictures/gifs; Poster credits to tina--- at Supernova Graphics & Web Design Centre!