"Behind every action there's an intention. Behind every intention there's a reason. But for every action there's also a consequence."

Park Yuna has made it as one of the most vicious, skilled, successful agents in X Intelligence. 

She's merciless, she's sly and she's never failed. 

But she doesn't expect to see her ex's face when she opens the folder of her new mission. Neither does she  expect to have to work undercover as his personal assistant to extract information on his possibly illegal deals.

And she finds herself drawn to him, falling for the same charms she fell for all those years ago.

And he becomes a danger to her. A danger to her career, a danger to her mission. 

She tries her best to resist him. To remember how he hurt her.

But some things never change.