Guardian City.
The last bastion of humanity, or a prison that keeps people trapped within themselves?
Humanity.
Once the ruler of the planet, now reduced to food for alien beasts.
Technology is no longer humanity's lifeline, and so the supernatural rises.
Ji Tian was born with innate wisdom. Before he could enjoy the happy life of having five wet nurses, Old Man Jiang kidnapped him.
Old Man Jiang: "You little brat, you're naturally bright. I found you in a trash heap, but I believe your future is limitless..."
Ji Tian: "You old geezer, you didn't think I'd know my intelligence dates back to the womb, did you? I know everything you've done to me..."
Old Man Jiang: "..."
Within the high walls, humanity clings to survival. Across the wilderness, alien beasts roam unchecked.
Ji Tian rises from the land of the abandoned, tearing through space, devouring ferocious beasts, and building his own forces.
"Don't get me wrong. I'm not trying to be a savior. I just want to get a little stronger, then a little stronger still."
The hunt begins...
It's not AI at the beginning, so reincarnation (prenatal transmigration) is a bonus. But there are some places where the heroine's character is unnatural and doesn't meet my expectations.