Fang Luo transmigrated to the world of cultivation. After a bit of digging around, he discovered that this body was actually the main villain of the novel The Fate of a Hundred Saints!
The Fate of a Hundred Saints had the most selfless protagonist imaginable, Bai Liehua. He dreamed of saving everyone he could, but in the end, the story still concluded with the villain destroying the world.
Because the novel's central theme was: tormenting self-righteous do-gooders.
Fang Luo had found this badly unfinished novel during an intensely edgy phase, when he hated self-righteous do-gooders who hurt others through misguided kindness. He'd wanted to find a novel that really put them through the wringer.
But The Fate of a Hundred Saints nearly made him cry, and from then on, he came to love saintly characters.
That was all, though. Although the original owner of this body was destined to become a world-destroying villain, Fang Luo had no intention of getting involved in the plot. He just wanted to find his own path of cultivation, travel the four seas, and seek immortality.
But the world developed in a completely different direction from the novel! Bai Liehua had actually been reborn from a future in which the world lay in ruins!
Now that this saintly man knows what the future holds, how will he treat the villain who will one day destroy the world?
Sometimes, the only reason I'm bad is that the protagonist thinks I am.
That said, Fang Luo really is ruthless. Beware.
One-on-one romance, pure love, no angst, and plenty of satisfying moments. A long cultivation story with the classic master-seeking and level-up progression, and a slow-burn romance.