Lee Young-joon is the vice-chairman of a major corporation. His world is shaken when, one day, his highly-capable secretary, Kim Mi-so, 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 plans 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. Kim Mi-so falls in love with Lee Young-joon as they heal each other of their past traumatic experiences.
