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.

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