She had a crush on him and confess. He likes her, but he can't accept her confession.    

She just got dumped and accidentally sleep with a popular guy in her college.

Everything started with a little white lie Eunji told her mom about Sunggyu and she never expected it would change everything in her life.

Stay away from 'The Princess' everyone said. He has no idea what they're talking about until she tripped over him and make his life a living hell.