What's Wrong with Secretary Kim

Lee Yeongjoon is a narcissist who can only love himself. The only human he approves is Kim Miso, the master of Secretary World. One day, Secretary Kim declares her resignation after the perfect chemistry for nine years.

A resignation letter returns as a proposal. Miso rejects Yeongjoon's proposal without a pause and starts the transition as her plan. While Yeongjoon is in shock by rejection for the very first time from a woman, he receives tempting advice from his friend Yusik.

Yeongjoon brings Miso in to give tremendous resignation gifts. Miso is impressed by the new sides of Yeongjoon. Miso goes out on a blind date and Yeongjoon hears Miso's plan. Confident but nervous, Yeongjoon shows unreadable behaviors.

Yeongjoon and Miso find new sides of each other after visiting the art center. They spend romantic time there. Meanwhile, Sungyeon comes back to Korea and meets his brother Yeongjoon. However, Yeongjoon's attitude toward Sungyeon seems awkward.

Yeongjoon, who only could love himself, starts to love Miso. Meanwhile, Miso needs to get used to her boss's unfamiliar behaviors. Without knowing that her feelings are tilted toward Yeongjoon, she stands next to Sungyeon wearing a pretty dress.

After a kiss, Miso takes a day off for the first time in 9 years. However, she does not know how to spend her day off since she never did before. Meanwhile, Yeongjoon is not okay with Miso's empty seat. In order to ease Miso's mind, he decides to join Miso's peaceful break.