What will you do if you meet your ex's in one room for your job?

How will you handle them? Is it possible to fall in love again to one of them? 

Or is it possible to fall for someone new even though they are there?

This is a story about Kim Myungsoo who got hired in a Blanc&Eclaire Magazine and became a part of the team to gather astonishing individuals for their anniversary issue. Unfortunately, those in the list were his ex girlfriends. How will be he able to work if they are going to return into his life?