Can you recommend a novel that tells the story of the female and male protagonists knowing each other since they were young?

I'm asking for the name of a novel ~
The specific content of the novel was as follows:
The female lead and the male lead had known each other since they were young and were enemies.
The female lead was the Prime Minister's daughter, the Empress 'niece, and the Crown Prince's cousin. She was quite favored in the palace, even more favored than the prince, because her aunt was the empress.
The male protagonist was the second prince, and his mother was the emperor's favorite concubine. Later, he became the emperor.
Because of her cousin, the female protagonist killed the male protagonist's mother (because the male protagonist saved the general wanted by the court and told the female protagonist, the female protagonist leaked the plot of her aunt, and the male protagonist was thrown into prison. In order to save the male protagonist, the male protagonist's mother committed suicide in the emperor's arms)
The male protagonist later became the emperor, the female protagonist's father retired and returned to his hometown, his brother suffered humiliation in the previous dynasty (because the female protagonist was the empress, the brother relied on his sister), the female protagonist's aunt was locked in the cold palace, and his cousin was driven to a desolate fief (because the male protagonist misunderstood that the female protagonist still had feelings for his cousin).
There is also a small clip where the female protagonist's brother hid a fake death medicine in the female protagonist's golden step when she got married.

Answer 1

This question might require more information to get a specific answer, such as the type of novel, plot, and so on. If you can provide more detailed information for my reference, I will try my best to recommend a novel that meets your requirements.