The modern King of Mercenaries, known as the King of Hell, is reborn as Xiao Chen, the orphaned ninth son of the Prince of Northern Pacification. From the very beginning, he faces a desperate situation: his father and eight elder brothers have fallen in battle, the imperial court views him with suspicion, and his entire household is left vulnerable and alone. To protect his family, he relies on extraordinary intelligence and an iron will that surpass the standards of his era. He trains himself, unites his eight exceptionally skilled sisters-in-law, reforms military discipline, develops trade, and wins the people's hearts. Facing repeated schemes by powerful court officials and the threatening cavalry of the northern grasslands, Xiao Chen advances cautiously, eliminates traitors, and outsmarts deadly assassination plots. With just thirty thousand elite soldiers, he takes on an enemy force of fifty thousand, restoring the spirit of the Northern Pacification Army in a single battle. He safeguards the peace of the northern frontier, allows fallen heroes to rest in peace, and carves out a path to survival for himself and his family.