What's Wrong with Secretary Kim (Korean: 김비서가 왜 그럴까) is a 2018 South Korean television series starring Park Seo-joon and Park Min-young. It is based on the novel of the same title by Jung Kyung-yoon which was first published in 2013, which was then serialized into a webtoon comic by KakaoPage in 2015. The series aired on tvN from June 6 to July 26, 2018, on Wednesdays and Thursdays for 16 episodes.