Forensic doctor Qin Zheng traveled through time and became Su Ci, the daughter of an ancient widow who was drowned. In order to investigate her father's injustice, she disguised herself as a brothel musician and collaborated with the Ninth Prince Xie Wujiu, who appeared to be a playboy but actually controlled the black market intelligence network, to solve the case. The two gradually discovered that the serial murders were related to the "witchcraft disaster" twenty years ago, and Xie Wujiu was actually the orphan of the prince who should have died in that coup.
