Lee Young Joon is the brilliant but narcissistic vice chairman of a major corporation who has relied on his highly capable secretary, Kim Mi So, for the past nine years. When Mi So unexpectedly announces that she is resigning to pursue her own life, Young Joon is stunned and determined to convince her to stay, believing he cannot function without her. As he tries every possible way to change her mind, he begins to realize that his feelings for her are far more than those of an employer.
As the two spend more time together outside the office, they uncover forgotten memories from their childhood that reveal an unexpected connection between them. While navigating misunderstandings, family expectations, and the challenges of transitioning from colleagues to lovers, Young Joon and Mi So learn that healing old wounds is just as important as embracing a new future together.
Based on the popular web novel and webtoon of the same name, What's Wrong with Secretary Kim.