Min Yoongi aka Suga 
The school's emotionally unavailable heartthrob. Girls just love bad boys, don't they? Min Yoongi was a natural born at heartbreaking. His cold and handsome demeanor is a chick magnet. But sadly, he's emotionally unavailable. 

Heo Nari, the school's sweetheart(not really) The sweet and adorable looking girl who puts up a tough front. You can never resist her charms. She knows from A to Z in heartbreaking. 

+  Lee Subin, a junior in Jisoo High. 
Vulnerable and innocent but is also a very determined person.

Bangtan Sonyeondan aka BTS aka The Jocks in school
Yoongi's clique. Also well liked in Jisoo High for being good looking and talented.

Kim Namjoon / Rap Monster - The oh so smart and amazingly tall senior who can sweep you off your feet with his y voice and cute dimples.

Kim Seokjin better known as Jin - The handsome but conceited senior. Girls swoon over his godly looks and gentlemen-like actions. Everyone favors him, even the teachers. 

Min Yoongi aka Suga, emotionally unavailable senior. ( You already know )

Jung Hoseok / J Hope - The happy pill. The senior who loves spreading joy and hope which can be too much to handle, according to Nari, other than that he's a sensible guy who's passionate in dancing. 

Park Jimin - The ily adorable sweetheart junior. His eyesmile and voice is to die for. He's good at getting girls and is secretly a ert along with the other boys.

Kim Taehyung aka V - The pretty boy who's popularity is extremely unbelievable, being a junior. He's known for being a little "bimbotic" but girls love seeing his 4D side. 

Jeon Jungkook aka Golden Maknae - The dashing junior who's a noona killer as well. Seemingly innocent boy who excels at everything but is actually a devil. He's sly and gets away with a lot of things.

Nari hates seeing girls getting their hearts broken over and over again. So she decides to help a poor girl who almost got her heartbroken into two.