In the late Qing Dynasty, in Yongchang Prefecture of Guandong, Prefect Jia Zhengdao—a jinshi degree holder who placed second in the imperial examinations—governs one prefecture and six counties with the help of his trusted aide Wu Shiye, fellow officials, and influential merchants and gentry. The arrival of a secret dispatch from the Grand Council throws the administration into chaos: the imperial court is covertly sending an “Eight-Prefecture Imperial Inspector” to investigate corruption. At the same time, an urgent order from the Ministry of Justice demands the capture of a fugitive fraud ring.

Pan Mengdie is the last “Xiguan Lady” of Guangzhou — once a legendary beauty, now the solitary guardian of a historic ancestral mansion in the Xiguan district. For nearly a century, she has fiercely protected her love, her family’s secrets, and the legacy bound to the old house that defines her life. Ma Sipeng, a brave and quick-witted community police officer, is assigned to a drug investigation codenamed “Xiguan Lady.” During the case, he becomes connected to Pan Mengdie and her descendant, Ye Yixi. As the investigation deepens, long-buried truths are uncovered, drawing all involved into a tense and emotional confrontation where law and humanity, family loyalty and blood ties, past and present collide — with lives hanging in the balance.