During the first year of the Tianqi reign, government agencies were thriving, while new and old factions competed for power, engaging in scheming and chaos. Shen Wen, a scholar from Qinan Prefecture skilled in carpentry, was unwittingly drawn into the theft of a royal treasure one day, thereby meeting Mu Siqing, a commander of the Embroidered Uniform Guard. Shen Wen discovered that the treasure the Embroidered Uniform Guard was searching for was actually the Six Harmonies Beast Diagram, the very diagram that had led to the massacre of his entire family. The Six Harmonies Beast Diagram contained secrets of the imperial court. In order to find his family's killer and unravel the secrets of the Six Harmonies Beast Diagram, Shen Wen decided to secretly infiltrate the Northern Garrison to uncover the truth of what happened back then.