I Became the Protagonist's Younger Sister

I woke up one day to find I’d shrunk into a baby, crying to be fed. At first, life went on as usual.

Then a System appeared and told me I was in the world of a novel, leaving Bai Nianxing no choice but to work hard.

But along the way, she uncovered the hidden secrets of this world. Who brought the glorious age to an end?

What kind of opportunities awaited in the primeval age?

And the biggest shock of all: the Demon God Emperor is my grandfather! The little sprite I saved on a whim is my grandmother!

All right, all right. What else is there about this world that I don’t know?