The story is about Son Naeun and Kim Myungsoo who were bestfriends last 7 years but because of an incident that happened between them, they declared themselves as enemy and threw away the bestfriend title that they've been chained together since their childhood days. What's the actually thing that caused them to be enemies? And what happened when they realized that they needed each other? Let's follow this one-shot to know what happened between them.