When Jing Xi transmigrates into the body of a medicine slave in the imperial palace, there is a dying kitten locked up with her.
She shares her rations with it, and even gives it a chance to escape.
Only later does she learn that the kitten is the Nine-Lived Demon Lord of the Spirit Cat clan.
He tells her, “Jing Xi, your sister will watch over the court, and I’ll protect this land for you. All you have to do is become the most honored consort of my demon clan.”
But one day, two hundred thousand demon beasts face the capital from across the river. The ruler of another world arrives with a sword. He stands before her and takes the blow head-on.
The enormous black cat dissolves into a sky full of starlight. His last words are:
“Jing Xi, in our next life… I’ll be human. Come find me.”
…
Years later, the demon clan is under her command, and the court is under her sister’s.
Holding a tiny kitten in her arms, she stands atop the land.
“I’ve been waiting for you a long time.”