Yu Yu transmigrated into a book, and not just any book: it was a super-powered, three-in-one plus edition.
In the first book, a classic tale of a Heaven's Chosen protagonist rising to power, Yu Yu kindly rescues a young Heaven's Chosen being hunted down, only to get the whole village killed. After the young man takes Yu Yu back to his sect, countless admirers see Yu Yu as a thorn in their side and target him at every turn.
In the second book, a story about saving a yandere, Yu Yu often looks after a lonely, helpless young yandere. In the end, the little bastard gouges out Yu Yu's Golden Core, just so the demon clan heroine, born with poor aptitude, can make a breakthrough.
In the third book, a tragic love story about a stand-in, Yu Yu loses his spiritual power and is kept as a pet because his eyes look seventy percent like the male lead's unattainable first love. After the stand-in heroine takes her place, Yu Yu dies at the male lead's words: "Useless thing."
Yu Yu: ???
Following the script? Not a chance. Absolutely not!
Now that you've run into me, your good days are over.
*
Cicadas chirp late into the night. The Heaven's Chosen young man, fleeing with serious injuries, clutches his wounds and finds a mountain village just as he reaches his limit. Facing a startled young woman, he manages to say just one word, "Help," before collapsing.
Yu Yu smiles faintly and pulls out ten bundles of rope.
I know you need emergency care, but don't panic just yet.
I hope you like your new home in the back hills.
*
When he meets the male lead from the yandere story, the young man is being bullied by his fellow disciples because of his filthy mixed human-and-demon blood. He stumbles to Yu Yu's feet, covered in blood and grime.
This time, the snow-white hem of Yu Yu's dress doesn't pause for even a moment.
Yu Yu strokes the chubby little bird whose heart and eyes are full of him.
Your wife is adorable. She's mine now.
Yu Yu feels no guilt about it at all. He even takes the stand-in heroine from the third book along with him. Who in their right mind would want a stand-in?
Yu Yu is thriving in the world of cultivation, completely unaware that deep beneath the sea, a beautiful merperson who plays an important role in all three books is laboriously hauling several sacks of seafood ashore.
The mermaid, proudly puffing out her chest: "The sea is so vast, but she just had to land on me. Her name even has the character for fish in it. She must have me in her heart!"
Theme: You create your own destiny.