6 years ago, Im Yoona and Lee Donghae married each other without their parents' knowledge.

They thought their love was forever but their love for each other didn't last, that's why they divorced. 

6 years later, Im Yoona is now the secretary of Sole Group's CEO but on a certain event, their CEO changed and what if her ex-husband is the new CEO?! How will she react that her ex is her boss? And to make things worse, are they supposed to get married, AGAIN?

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