Final Chapter of the Extraordinary Records of the Civil Investigation Bureau.

Summary

Su Yu and Hou Mo Hua discover an ancient underground city belonging to the Qian Kingdom, a small but prosperous nation with significant gold reserves. After being forcibly incorporated into the Yan Kingdom, the Qian people were threatened with enslavement. In response, their Duke beheaded the Yan envoy and secretly relocated thirty thousand citizens underground to preserve their culture and independence. The underground city, Jiuhai City, with nine districts, represents their resilient survival strategy against oppression during the Eastern Zhou period.

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