I'm looking for a transmigration novel where the male lead is a demon and the female lead is a human.

I've read a transmigration novel, but I can't remember the name. I hope you can help me.
The gist of the story was that the female protagonist traveled to ancient times and happened to be engaged to the man who died of illness. Therefore, the man's younger brother replaced his brother and sister-in-law to perform the wedding ceremony (but not really getting married). This brother-in-law had a good friend who was as cold as ice. His martial arts were relatively strong. It seemed that the female protagonist fell in love with this hero later. However, this hero was unwilling to face the female protagonist's feelings. Later, the female protagonist found out that before she transmigrated, the original owner of her body knew and loved the hero, and the hero was a demon (if she remembered correctly, it should be a snake demon). In the past, the female protagonist would sneak out to find the hero every night. In the end, it seemed that the hero was about to die. He changed into a fake body and married the female protagonist, but was discovered by the female protagonist. However, the last old man saved the hero, which was this demon. Then, the female and male lead ended happily.
He couldn't remember the title of the book, but he was sure that it wasn't the Rage of the Ink Snake. He hoped that those who knew about this novel could help him think about it. He was not only grateful.
Thank you!

Answer 1

The following examples can be used for time-travel novels where the male protagonist is a demon and the female protagonist is a human:
The Fairy Prince's Journey to Time.n
Description:
The female lead, Lin Yao, was a modern girl who accidentally transmigrated to a strange world and became the princess of a fairy kingdom. She met the prince of the human kingdom, Li Zeyu, and began a love story that crossed races. In the process, they experienced many difficulties and challenges, but finally overcame everything and lived happily together.