During the Tianxi period, the capital was filled with ghosts and ghosts. Seven family members of officials and businessmen died violently one after another, and the scene was strange, leaving only half of a bloody nursery rhyme. People are in panic, and rumors of ghosts are rampant.
Yan Jiyi, a six-door executioner with royal blood, was ordered to investigate the case. He firmly believes that "the sky is vast and everything has its traces", and he cuts through the fog with an ice-cold heart and delicate eyes. The daughter of the servant who died in the secret room even though the silver needle was not black, and the candle tears flowing backward point to the death of the wealthy businessman on a windless night... Every piece of ironclad evidence leads him to a deeper paradox.
When all the evidence was perfectly closed and pointed to an impossible real murderer, Yan Jiyi rubbed the cold black iron token with his fingertips and realized for the first time: this precise "truth" itself was a flaw. Underneath the tricks of the ghosts, there is a human calculation that is more terrifying than the ghosts; behind the series of murders, a shocking chess game aimed at tearing apart the government and the opposition and shaking the country has been completed.
And he, this lonely minister who only certifies evidence, the sharpest weapon in his hand is becoming the first chess piece that the chess player wants to break. When order itself becomes a mask of lies, should we abide by the iron law, or should we use our body as a blade to cut through the dark curtain surrounding the dragon chair?