Set in the early days of the Joseon dynasty, Guk In Yeob (Jeong Yu-Mi) was the only child in a noble (‘yanban’) family. She was famous for her beauty and stylish appearance. Due to an incident, her status fell to the lower class as a slave (‘nobi’).
As she struggled through her misfortune, she became stronger. Servant Mum Myeong (O Chi Ho) was the most attractive servant in Hanyang (modern day Seoul), but he was also a mysterious man who hid his real identity and pretended to be a servant.
Source: Maids – AsianWiki