Kim Mi-So was exemplary secretary for Lee Young-Joon for 9 years. She put up with everything so she car earn enough money to pay out her family's debt. But now, she wants some time for herself and does not plan to give her life for work, but wants to find a romance with a regular guy. And so, she tells everything that she's quitting work. Lee Young-Joon finds that unacceptable, but hires Kim Ji-Ah as her replacement. During that one month period while Kim Mi-So is training her replacement, Young-Joon decided to put some work into making her stay, even if taht means he has to get involved romantically.

After an over the top date, Young-Joon goes for a kiss, but fails. Kim Mi-So goes on a blind date and Young-Joon become jealous. Furthermore, in a competition games, when she teams up with one of the co-workers, Young-Joon goes so jealous he decides to cancel this event in upcoming years. Trying to leave he injures his leg on the stairs. When Kim Mi-So tends to his wound, she notices a scar on his leg just above the ankle. Young-Joon in his jealousy tries to test Kim Mi-So as to how close she would let her co-worker come in order to win the game and they end up dangerously close with her on top of him. On a side note, a mysterious renowned writer of a romantic novels that Kim Mi-So and especially Kim Ji-Ah are fans of is arriving to Korea.