I need a novel that focuses on the demon king and reincarnation. What do you recommend?

Western fantasy,
A noble lady came to the main character's village. The female lead didn't like the main character. Then, the protagonist picked up a helmet of armor and sealed the demon king.
She forgot what happened in the middle.
The protagonist put on the helmet and became the new demon king.
The female lead gave birth to a child for the main character. Because it was a demon seed, she went to the Elf Forest to obtain vitality. It seemed that she gave up in the end and died? He had forgotten.
The human race attacked the protagonist. Before the protagonist died, he asked someone to find the young female protagonist and let the female protagonist choose whether she wanted to go back to a few years ago to see why he became the Great Demon King.
After the main character died, the female protagonist, who was hiding behind the throne, entered the magic array and returned to the village from a few years ago.
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。。。What was this book called? After reading it for a few years, she had forgotten about it. I can't find the keywords I remember…
Erm, there might be some deviation between her memory and the plot of the novel. After all, it had been several years... There seemed to be a sentence in the book, starry sky and so on.

Answer 1

He might like the fantasy romance novel "Soul Sacrifice to the River of Forgetfulness." The main character in the novel owed the Grim Reaper 700 years of love in his previous life, but in this life, he fell in love with a super demon king. This book also has a plot involving reincarnation. I hope you like this fairy's recommendation. Muah ~😗