The heroine was secretly transferred as a slave who was guilty of the subjugation of the country and was married into the palace. She wanted to poison the tyrant on her wedding night, but she encountered the poisonous male protagonist. The male protagonist forcibly detains her and names her as his queen in front of everyone, which directly disrupts everyone's chess game. The heroine is forced to change from an "assassin" to a "queen". While surviving between the queen mother, the noble concubine and various informants, she secretly investigates old cases of the country's subjugation and gets close to the imperial hospital and the secrets of the inner court. On the surface, the male protagonist is crazy and cruel and acts like a monster every night, but in fact, he uses her to fish and clean the harem. The two exchanged harsh words and played tricks on each other, and gradually formed a strange tacit understanding of "harming each other on the surface and saving each other behind the scenes" in one harem case after another. At the end of the volume, the heroine used a "cold palace arson case" to overthrow the imperial concubine and secure her position in the back seat, but she also discovered that the identity of the princess she was replacing had a hidden secret - the real princess was actually still alive and was secretly imprisoned by the queen mother...
