Searching for the name of a novel

The female protagonist was very strong and her martial arts skills were very high. At first, the male protagonist was not as strong as her. She helped the male protagonist win the world and even gave her martial arts secret manual to the male protagonist to practice. It seemed that no matter how old the person practiced martial arts, their appearance would stop at that age. No matter how old they were, their appearance would not change. The female protagonist gave birth to a princess first, but in order to help the male protagonist win the world earlier, she gave birth to a boy. The second one gave birth to a boy. The male protagonist had an original wife who looked very good on the surface, but actually hated the female protagonist to death. In addition, the female protagonist did not allow the male protagonist to have sex with other women, not even the original wife. In the middle, in order to escape from another country, the male protagonist used the princess of this country (it was the relationship with the princess). After the female protagonist found out, she was very angry and hurt the male protagonist. The female protagonist's brother was the male protagonist's subordinate and injured the female protagonist (in order to protect the male protagonist). The female protagonist almost lost her life. It seemed that when the female protagonist gave birth to her second child, she used a knife to cut open her stomach. The male protagonist's first wife was very bad and always tried to sow discord between the female protagonist and her son (when the female protagonist's son grew up). The first time the male protagonist met the female protagonist was when he was chased to the river and happened to meet the female protagonist talking to her senior brother in the forest. Later, the second time he saw her was in his palace. In order to please him, his first wife gave him a few concubines. The female protagonist was one of them (but the male protagonist did not know). The female protagonist married him at first to develop her talent and help him get the world. At first, she told the male protagonist that she would help him get the world, but only her child could be the crown prince. She would not make a wedding dress for others.