The Lycan's Sin - Chapter 1: Four Dead Witches

When Li Xianyu was 20 years old, he received his father’s inheritance, an 18-year-old great-grandmother who was incredibly beautiful.

Li Xianyu: “Great-Grandma, why are you so young?”

Great-Grandma: “That’s because I died when I was 18 years old.”

- Description from Novelupdates

A protagonist reborn in another world.

This is a reincarnation/isekai story, about Matt (later TreeTree), an overpowered tree in a fantasy world that serves as the battlefield for an ongoing conflict between demons and the heroes summoned to oppose them.At first a bystander, over a long period of time, TreeTree will learn all sorts of skills, gain levels, and in doing so, build up a forest, train young subordinates, protect a village, and more.

In the cyberpunk era, corporate alliances dominated the world, and both the humans and witches were ens*aved by advanced technology, becoming nothing more than fuel for society. Unwilling to become a company dog, Xu Yang decided to run away, while saving the cute and powerful witches from the giant enterprises, together they embarked on a road of innovation!

- Description from Novelupdates