The Duke (Ha Jung-woo) wants to marry the Japanese noble Miss Hideko (Kim Min-hee) in order to obtain her property, and then sends Hideko to a mental hospital on the grounds that she suffers from mental illness. In order to realize his conspiracy, the Duke sends Nam Sook-hee (Kim Tae-ri), who was born in a family of thieves, to Hideko as a maid. In this way, the two of them work together, and Hideko, who is ignorant of the world in the boudoir, and her huge wealth are simply in their pockets. In the eyes of Nam Sook-hee, Hideko is innocent and fragile, kind but sensitive. As time goes by, a sincere friendship develops between the two who get along day and night, and the Duke's hypocritical and greedy mask gradually makes Nam Sook-hee want to nauseate. However, in the face of high rewards, Nam Sook-hee chooses to betray. Under her lobbying, Hideko and the Duke elope and hold a wedding ceremony. At this time, an accident happened that Nam Sook-hee could never have imagined.