I Am Heaven's One and Only Chosen Savior

The first law of the novel world: If you’re reading a story and come across a character with the same name as you, no matter how minor their role, whether they’re a side character or a villain, you must read and memorize the entire story to prepare for the possibility of transmigrating into it.

But... what if you transmigrate into a book and find yourself caught up in a mystery that began before you were born?

Wang Ye transmigrated into a book, but knew nothing about the story. In a cultivation world on the brink of apocalypse, she set about building infrastructure.

The living dead became perpetual-motion machines in her hands, and she refined the uncanny into a cheat that boosted her mental power. She even came up with crops that yielded three thousand jin per mu while obeying the law of conservation of energy. In short, as long as she had a big enough imagination and a ruthless enough heart, there was nothing she couldn’t do.

Before Wang Ye started reclaiming the wilderness:

“The world is in calamity, humanity is doomed! We’re all finished!”

After Wang Ye started reclaiming the wilderness:

“Immortal, we really can’t increase the population anymore. There’s no room left in our territory!”

“Immortal, this demon chasm is almost picked clean. Let’s switch to another one... no, another place. Let this one recover for a while!”

Wang Ye: “If there’s no room in the territory, why not expand it? We could colonize other places, too. Do you have any idea how important population is to humanity? Everywhere outside our territory is experiencing population decline. Humanity is in peril, and you’re asking me to enforce birth control? Are you trying to destroy humanity?”

“You’ve picked it clean already? How many times have I told you to develop sustainably? Do you even know what sustainable means? Ever heard of balancing income and expenses? If one demon chasm isn’t enough, get a few more! Isn’t energy from outside just great?”

As other holy lands teetered under the erosion of the demon chasms, Wang Ye’s eyes lit up.

“Leave it to me!”

As for the original male and female leads:

“Why are you fighting over me? I really don’t feel that way about him/her.”

Theme: The rise of humanity through unremitting self-reliance