Please recommend a transmigration novel with a fictional world setting.

The female lead was a girl who could fight very well. Her father was a policeman. Her father had once become a vegetable while on a mission. It was only after she transmigrated that she found out that her father had also transmigrated and became the male lead's good brother. He should be the boss of some place. The female lead transmigrated because of her boyfriend's framing. She had transmigrated to become a princess who had been captured by the male protagonist (the male protagonist was a palace lord, and his identity seemed to be a prince). In order to save her father in that time and space, she claimed to have fallen in love with the male protagonist. After they fell in love, the female lead died to save the male lead and returned to the modern world. Her father also returned. In order to avenge the female protagonist, the male protagonist killed the emperor and became the emperor himself. As the female protagonist was worried about the male protagonist, she also used her true appearance to transmigrate. The ending was good. [Note: The male protagonist has a super cute younger brother who is good at using poison. He should be six or seven years old.] Thank you, everyone, for helping me look for it. Thank you ~ After I found it