So-Ra (YOU) is the main character in this story, who has a crush on the young school doctor Kim Jongin, commonly known as KAI by the students. So-Ra gets butterflies in her stomach everytime she sees Kai walking pass her down the corridor. She wants to see him every day and soon enough she makes a bunch of excuses just to be able to see him. Her best friend Jane (BPPOP) whom you've known since kindergarten tries to help you, when she can't convince you to like someone closer to your age.

So-Ra - student of Sun Hwa Arts School 

Jane - So-Ra's best friend, dating Aron (Nu'est), student of Sun Hwa Arts School 

KAI a.k.a. Kim jongin is the school doctor of Sun Hwa Arts School

Kim Jongdae - the biggest player in school, student of Sun Hwa Arts School

Aron -  Dating Jane, is a really nice person and good student

Park Jeong-Su a.k.a Mr.Park and Lee Teuk, The school principle, who likes to flirt with the female students

Byun Baekhyun - Your school teacher, acts more of a principle than Leeteuk ever will, treats his students well

Lay - Your dance teacher, which is the person you trust the most besides Jane

Luhan - Friends with Jongdae and is actually really nice to you if Jongdae's not around

( I did put any age, 'cause it kinda seems pointless in this story anyway ) ;)