Ask for the name of a novel

Previously, I only remembered the general plot, but I couldn't remember the names of the male and female leads.
The male lead seemed to be the fourth brother or something like that, and later became the emperor. The female lead was his cousin, Gege. The female protagonist asked the male protagonist to wait for her and not consummate the marriage with anyone else before marriage.
In fact, it was a story of two lives. In the first life, the male lead consummated his marriage with someone else and had a child. The female lead's family helped the female lead fake her death. Then, the female lead went to Jiangnan and met the second male lead. The second male lead was only the female lead. When the male lead was in Jiangnan, he even saw the second male lead and the female lead walking hand in hand. Later, the male protagonist was poisoned by his son to murder the female protagonist and the second male lead, but he still went to save the male protagonist.
In the second life, the male protagonist dreamed of the female protagonist and the second male lead in Jiangnan. When he woke up, he still held the jade pendant in his hand. The female protagonist also had the same dream. Then, the female protagonist requested that the male protagonist only have the female protagonist, and the male protagonist agreed. After that, the male protagonist married the female protagonist and became the empress.
The second life was the main storyline, while the first life was memories.
That's about it
The main plot was the second life, and the content of the first life was what the male protagonist dreamed of.

Answer 1

The name of this novel was 'Sword Comes'.