"My Fair Lady" centers around Hye-na Kang (Yoon Eun-Hye), an heiress to the Kang-san Group and owner of the palace known as "Lady Castle." She lives with her servants as her parents died in a plane accident and her grandfather raised her as a child. Then on day, a young scamp named Dong-chan (Yun Sang-Hyeon) becomes a butler at "Lady Castle" in an attempt to gain Hye-na's money and heart. Things become even more complicated as rich lawyer Tae-yun (Jeong Il-Woo) steps in-between them ...