Lee Young-joon (Park Seo-joon) is the vice-chairman of a major corporation. His world is shaken when, one day, his highly-capable secretary, Kim Mi-so (Park Min-young), announces that she will resign from her position after working for Lee Young-joon for nine years. Young-joon then decided to do whatever he can after talking to his best friend, who happens to be a Board Director in his company, to make sure Mi-so stays by his side.
Throughout the journey, Lee Young-joon planned plenty of things while Kim Mi-so decides to find the elusive man from a past traumatic experience that she was a part of when she was a young child. Both were unknowingly aware that they shared the same experience of trauma but ultimately, Kim Mi-so falls in love with Lee Young-joon as they heal each other of their past traumatic experience of being kidnapped.