Undercover Detective, Picked up the Amnesiac Empress at the Beginning

Lu Qingya traveled through time and became an undercover policeman. During the day, he fished in the criminal department, and at night, he licked blood from the knife edge of the rivers and lakes. His biggest worry is that his identity is about to be exposed, and the amnesiac girl he picked up is too spendy. Until that day, the Imperial City Division's army pressed forward, and the eunuch at the head shouted tremblingly to the girl behind him: "Your Majesty!" Lu Qingya looked at the undercover document "Cracking down on crime and eradicating evil" on her body, and then looked at the empress in front of her who had regained her memory and was smiling half-heartedly. Is it too late to surrender now? [The court is my home, the arena is my hobby, as for the heroine... Wait a minute!