After transmigrating into a book, he becomes the cannon-fodder fiancé of the original story's lovesick, possessive princess.
He knows all too well that in the original plot, his arrogance and controlling nature lead to the princess torturing him to death.
To stay alive, he awakens the [Villain's Devoted Lackey System]. As long as he treats the princess well, he gets rewards.
So he completely changes the original owner's ways and goes all out to please her, hoping that once she falls for the original male lead, they can part on good terms and he can bow out gracefully.
But he never imagined the lovesick princess would be reborn too. His devoted lackey act only makes her think, “My fiancé is so obedient. I like him so much.”
The writing is so good that I will reward the author by being the male protagonist.
When can a male protagonist be tough for once?
Yes, yes, force, force, still force, survive in desperate situations, it's fun to watch, quick updates
This is indeed possible
The writing smacks of AI, but the setting is generally acceptable. Although the plot is a bit off-putting, after all, I just came to see the yandere.