Xiao Chen, a man with extraordinary skills, unexpectedly travels through time and becomes the only male heir of the Prince of Zhenbei's household. His father and elder brothers were all killed on the battlefield. To save the entire Xiao family, Xiao Chen joins forces with his eight elder sisters, using a modern tactical sand table and his contemporary strategic thinking to outwit the enemy and bring the soldiers of the Zhenbei Camp under his command. Through a series of investigations, he uncovers the truth about the current court: the eunuch in charge schemed to harm his father and elder brothers in order to seize the power held by the Xiao family. After discovering the truth, Xiao Chen vows to restore the Xiao family's glory within a hundred days and demand justice from the imperial court!