What's Wrong With Secretary Kim revolves around the narcissistic Lee Young Joon, the vice president of a company run by his family. He is very self absorbed and thinks highly of himself, so much so that he barely acknowledges the people around him. Lee Young Joon has a capable and patient secretary in Kim Mi So who has remained by his side and worked diligently for 9 years without any romantic involvement. But Mi So has grown tired of her frustrating boss so when she decides to resign from her job, hilarious misunderstandings ensue. After 9 years of their strictly-workplace relationship, can it now develop in something more? -Adapted from the novel "Kimbiseoga Wae Geureolgga" by Jung Kyung Yoon.