I Am the Great Sui Dynasty, but I Can See Through the Evil Spirits in the World

There are no monsters in this world. Liu Yan, the patrol officer in charge of patrolling the sky, holds the double flags of black and white. The white flag does not investigate the murderers, and the black flag catches the monsters but does not kill them. Three hundred and seventy-two were demonic cases, and 369 were man-made disasters. The hungry people who were eaten by Yi Zi were described as fox demons and cannibals, and the refugees who resisted taxes were described as snake spirits causing chaos. As long as the ink pen on Liu Yan's hand writes the word "demon", he can exchange for food relief, save lives, and quell party strife. But if you write this word too much, a living person will become a monster. Until thirteen babies in Hejian Mansion were disemboweled, an old song from seventeen years ago sounded again. When Liu Yan stepped into the snow-sealed city, he realized that he was no longer investigating a demon. It's the human heart. "The thing I regret most is writing some people into monsters." Under the court, the left and the right have been fighting each other for twenty years, and he has always been the scabbard passed around. But this time, the knife in the scabbard has to be unsheathed by itself.