There has been a legend about the Bloodthirsty Order circulating in the world - it is said that under the blood moon, after performing sacrifices, an entire city can be massacred in an instant through the Bloodthirsty Order. Mei Liu, a thief who lives in the outskirts of the capital. In addition to doing some theft, he and his brothers also act as informants for the Six Doors. When the chief arrester suddenly dies suddenly, Mei Liu has to participate in the investigation. The night of the blood moon was coming, and the ceremony to restart the bloodthirsty order was ready.