During the Jiajing period, the power of the strict party was transferred to the government and the public, and the government's principles were rusted. A series of murders broke out in the capital, and the dead left strange blood letters. Shen Hanchuan, a member of the Jinyi Guards of Qianhu, Fusi, North Town, holding a rusty knife symbolizing the dust of legal principles, was ordered to investigate. The clue actually led him to an unjust case of collaborating with the enemy twenty years ago - and that was the case that his father, who died in the line of duty, handled. Behind the murder, the mysterious organization "Spring and Autumn Bi" used killing to end chaos. The powerful officials in the court tried their best to cover it up. Every time Shen Hanchuan got closer to the truth, the figure of his late father became increasingly blurred. When the foster father he trusts, the woman he loves, and the justice he pursues are all indistinguishable, he must use that rusty knife to split the fog that shrouds everything, and cut his own way out of the machinations and blood.
A rusty knife can cut through, but the truth never dies. This is a lonely journey about historical mysteries, the sins of the fathers and personal redemption.
