The Princess And The Bad Boy (Niall Horan Fanfic)

Its a story about double kingdom but single country (Ireland). They obviously hate each other.
Princess Katherine from the kingdom won't allow anyone to call her princess as she wanna stay simple and doesn't want anyone to know about her real identity. No body knows that she's princes except her family and the people who work at the palace and her best friend Shannon.
Niall Horan from the other side of the country is a bad boy and literally hate the other half. He would probably kill if he sees anyone from henry's family.
But look how the destiny plays, they go to same college and are often in same classes.
Would he come to know? Or if he does what would he do? or what if he falls in love with his enemy?