In the year of Tianqi, during a time of mechanical marvels and political strife between old and new factions, Shen Wen, a scholar from Qinan Prefecture skilled in woodworking machinery, unwittingly becomes involved in a theft of a secret imperial treasure. This event leads him to meet Mu Siqing, the leader of the Jinyiwei. Shen Wen discovers that the Jinyiwei is searching for the very treasure that caused the destruction of his family, the Six Harmony Beast Map. Within this map lies a hidden secret of the dynasty. To seek revenge on those who wiped out his family and unravel the mystery of the Six Harmony Beast Map, Shen Wen decides to infiltrate the Northern Garrison and search for the truth from years past.