What's Wrong with Secretary Kim is one of the most popular K-dramas of all time, thanks to its cheesy romance storyline between narcissistic businessman Lee Young-joon (Park Seo-joon) and his loyal secretary of nine years, Kim Mi-so (Park Min-young). Fans couldn't get enough of the tantalising chemistry shared between Seo-joon and Min-young and the dating rumours immediately started circulating like wildfire.