The Simple Life of Killing Demons - Chapter 52Book 12:

The unparalleled Pill Emperor is reborn into another life, practicing unique cultivation techniques and refining pills that others cannot. Occasionally, he would offer advice to those so-called masters of pill dao, while casually recruiting a few talented disciples to follow him.“Want a cultivation technique? No problem!”“Need a pill? No problem!”“The real question is, have you hung out with me?”In this life, Mo Wangchen is destined to reach the pinnacle once more, to dominate with his pills and reverse the heavens with his martial prowess!

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

Zhen Zhen was reborn in the forest area in the 1960s with a drop of the blood of the ancient gods. The awakening of the blood of the gods not only gave Zhen Zhen one power after another, but also made her the most favored little lucky star in the family!

- Description from Novelupdates

The mentally disabled 13 year old daughter of the Ye family, one day re-births! She rules over the Omnipotent God’s Cauldron, she possesses a spirit cultivation space. She’s no longer the good-for-nothing, abandoned girl who everyone bullies whenever they see her! With her incomparable poisons, even miracle doctors have to move to the side.

Spirit beasts beg for contracts, but too bad, even the God of Beasts have to call her Boss. Scum father, you dare to abandon your wife and daughter, she will surely make him destitute and homeless. People of the world, you dare to bully her, to insult her, she will definitely pay them back a hundredfold.

Reborn again into the world, she returns as a sovereign, but who knew she would attract the nefarious-blood-thirsty-demon him. He’s definitely the sly emperor who doesn’t hesitate to kill and cut down anyone, but he transforms into a harmless foolishly cute prisoner prince of an enemy country……

- Description from novelupdates