I used to read a time-travel novel, but I forgot its name.

The content was about how the woman traveled to ancient times to meet the male protagonist. The male protagonist told the female protagonist that his weakness was his heart. The female protagonist stabbed the male protagonist with a knife. After that, the male lead was injured and did not die. Later, the female lead had the male lead's child. When the child was four or five years old, the male lead came to take the child away. The female protagonist went to ask her for a child again. After that, the female lead also stayed at the male lead's place. But the male lead already has another woman by his side