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12 year old Yoona and Victoria had been best of friends since kindergarten. After a school trip they decide to make a trip of their own. At dawn Yoona returns alone to the camp in panic and ever since no trace of Victoria has been discovered. 14 years later Yoona is a successful deputy running after the bad guys all around South Korea and is knowingly engaged to Lee Donghae, CEO of his father's business. After receiving a mission to chase down a fugitive, whose shot down the president's son, she calls off the wedding. However, within this mess she doesn't know that the fugitive is already in Seoul, Korea seeking shelter. Within Victoria's (the fugitive) flight for safety she runs into Taecyeon and Donghae. In a complicated manner she gets entwined with both Taecyeon and Donghae bringing everyone closer together when Yoona finally discovers her. Underneath this mess Yoona faces difficulty confronting her feelings and her friendship, Victoria pinned between the three others, Taecyeon forced to reorganize his life, and Donghae who is confronted with a different reality than he's ever known.