A revenge drama set in the Seoul Regional Office’s Tax Division.
Hwang Dong Joo is the chief of taxation division 5 at the National Tax Service. He works hard to trace money that is hidden from the tax service. His team includes Seo Hye Young, who has a bright personality and his boss is Oh Young.
Meanwhile, In Tae Joon is the director of a regional tax office. He is an ambitious man, who has earned his way to the top through corrupt and illegal actions, all-the-while maintaining his cocky attitude.
In the royal palace of King Jung-Jo, court nurse Chun-Ryung (Park Jin-Hee) is called into the quarters of the royal concubine Hee-Bin (Yoon Se-Ah). One of the royal concubine's maids Wol-Ryung (Seo Yeong-Hee) is found hanging to death in her maid chamber. Court nurse Chun-Ryung investigates the area and realizes fairly quickly that Wol-Ryung did not commit suicide.
Nevertheless, the supervising maid orders court nurse Chun-Ryung to classify the woman's death as a suicide. Otherwise, a forthcoming scandal would jeopardize royal concubine Hee-Bin's source of power and, consequently, the maids source of power.
Meanwhile, court nurse Chun-Ryung conducts an autopsy on Wol-Ryung. She discovers a startling secret. Wol-Ryung recently gave birth to a child, even though maids are sworn to keep their chastity for the King. Court nurse Chun-Ryung is now almost certain that someone murdered Wol-Ryung and begins her own secret investigation.