It's a Shame to Dress up as the Emperor's Sister-In-Law of the Male Protagonist of a Sadistic Novel

Shen Xi traveled through an ancient book of sadistic stories and became the substitute sister of the heroine Bai Yueguang. After the heroine came back, the hero abused his body and mind and took the substitute's blood every day to make medicine for the heroine. In the end, the double was sent by the male protagonist to assassinate the emperor, and was stabbed to death on the wedding night by the villain emperor who was pretending to be sick. When Shen Xi first wore it, it was the wedding night, and the emperor who was pretending to be a pig and eating a tiger was lying on the bed, only an inch away from the knife in her hand. She and Xie Chengkong looked at each other. "Why don't you take action, my beloved concubine?" Xie Chengkong asked. Shen Xi's legs went weak, he knelt on the ground and held the dagger with both hands. "Your Majesty has misunderstood my concubine. I am not trying to kill you, but I have obtained a new precious dagger. I have come here to present it to your majesty as a wedding gift for you and me!" ——————— The scumbag male protagonist Xie Chengyi and her sister Bai Yueguang knelt at the foot of the stairs, looking at the woman sitting in the arms of a high-ranking man, and said in a weak voice: "Meet the emperor's wife." The palace attendants brought in dozens of wooden barrels and placed them in front of Bai Yueguang. Xie Chengkong touched Shen Xi's hair in his arms and looked coldly at the people below. "I heard that my concubine's sister is bloodthirsty, so I specially prepared more than ten kinds of fresh blood, including pigs, ducks, cows, sheep, deer, etc. You can drink it if you don't finish it, and you are not allowed to leave." ———————— Xie Chengyi has been waiting for news about Shen Xi's successful assassination of the emperor for many years. He waited and waited, and when the whole family was being executed, he only waited for the edict to confer Shen Xi as queen. Intent: To turn the female supporting actor into a singer