"Living corpse merchants" appeared frequently in the Xishi Night Market in Chang'an of the Tang Dynasty. Shen Yan, the watchman of Xinke, discovered that the dead were all holding ambergris engraved with strange rings. As the investigation deepened, he uncovered the secret of the Xuanwu Gate Incident - the prince who died in the battle returned in an "indescribable" manner, and the blood flowing in his body was the key to sealing the secret. When the intrigues of the court are intertwined with the erosion of the outside world, Shen Yan must choose between becoming a guardian or being assimilated.
