Seo Eungi- Is 20 years old and has had over 20 relationships. It isn’t that she is easy or likes to date around; it’s that she can’t seem to find any luck in love do to a curse.  She is a bright and happy person no matter what happens to her, and she always continues to fight for what she wants until the very end. People think she is a little dim witted but its only because she blindly trusts people and marches straight towards anything put in her way.

Roh ji hoon- A sweet kind hearted boy who's chic and has lots of cool charisma, he transferred to Seoul University from a local college. He likes eungi at first sight but once he starts hearing of the thirty day curse that surrounds her he shy’s away.

Jung Ilhoon – he’s the young master of the school, protecting all the students from gangs of surrounding colleges who try to mess with the Seoul university students. Even though he protects them he is not very kind to them, the only people who Ilhoon seems to be genuine towards are his close knit friends who happen to also be the band of the university BTOB.

BTOB- the popular band of Seoul University. Loved by every student and envied by every band. They double as the protectors of the students.