MTL - Engraved in Bone - Chapter 11 Taifu's Fanwai

Qin Nuo transmigrated into the Great Zhou dynasty, becoming the dim-witted Ninth Prince. As if it’s not enough to be a female transmigrating into a male, (s)he thought that (s)he could just enjoy a life of drinking, eating, and being merry–but no. He ended up being pushed to do something way beyond his abilities and entered the fight for the throne. Internally there is strife among brothers, and a powerful official with great authority; externally there are foreign powers looking to invade, and the discontent of the people that is boiling over. How is he supposed to pave a path through this mess both domestically and abroad? It’s hard to be emperor, and even harder to be a good emperor! This is a story about an emperor farming. While others are farming a field, he’s farming a whole imperial court.

- Description from Novelupdates

Kaito Nakamura, a shy university nerd, thought he’d found love when the stunning Aiko chose him as her boyfriend. Their sweet, fluffy romance fills his lonely world with hope—until he discovers she’s cheating on him with multiple guys, reveling in the taboo thrill of betraying someone so innocent. Heartbroken and humiliated as explicit photos of her circulate online, Kaito’s tears are interrupted by a mysterious popup: the “Revenge NTR System Beta.” Promising retribution but with a chilling condition — he can’t break up with her.Contains Ntr, read at your own risk

On the brink of destruction, I regained consciousness and found myself back in the past, 20 years ago. In order to have a peaceful retirement, I must prevent the impending doom.

Synopsis is in the beginning first chapter, so you can try to read it first.Zhang Fei is an ordinary human, but he is also an Incubus, and he also a Heavenly Fox.