The Mage of Eternity - Chapter 1: "Maximum Level" Mage

Once upon a time, a hero had been summoned to a different world in order to defeat the demon king. After the war stretching 3 years ended the commendable hero slew the demon king. And he was forcibly deported back to earth after being dismissed.

Such bullshit!

Elves in addition to beast race, dwarfs and demon race. Even though I wanted to make a harem in the different world I saved! My dream will not come true on earth, where there is no magic at all. Thus, the hero returns on his own. Without the blunder of being extradited to earth this time, he will build a harem of his own in a different world.

Years ago, Earth was indoctrinated into the “System.”Earth was not the only place with the System, however. With the System came the other races, Invaders. The Invaders had one goal, to obtain ownership of this new habitable planet. This created a bloodbath, and for years the war raged.This didn't really have much to do with Derek. Derek was kind of a loner. Yeah, he enjoyed the occasional chat or drink with others, but he never stayed in one place too long or really got to know anybody new.Derek did happen to be rather strong. After the years of fighting monster and Invaders alone, he had become quite adept at surviving. One thing that helped keep him alive was his refusal to get involved with others. He rarely cooperated with teams.One day, Derek broke his rules and decided to lend some help, as the mission didn't seem too hard. He should have stuck to being alone.

This is a world where humans, demons and mysterious beasts coexist.

Humans cultivate mysterious qi. Demons cultivate corporeal bodies. Mysterious beasts cultivate soul perception.

A legend says that in the middle of an endless rainforest, there are extremely powerful existences; they are called demon kings.

Some demon kings have a tyrannical corporeal body, some are experts in illusions.
Some demon kings are proficient in magic, some can even move mountains.
Some demon kings are able to sense things thousands of miles away.

These demon kings rarely appear in the human world. Even if they emerge in the human world, they would reincarnate in human form; assimilating with mankind while seeking to breakthrough realms…

- Description from Novelupdates

The prostitute of the Feng family was actually reduced to living in a haunted house.

At first, everyone thought that she would cry, make trouble, and hang herself, but she was quiet every day, without making noise, and set up a fortune-telling stall to earn living expenses.

A few months later, everyone in the Feng family invited her back.

She smiled and shook her head. Going back to the Feng family, there are no female ghosts to do housework.

Behind him, Lord Wei, who is the master of the city, aggressively embraced his fiancée in his arms, “My wife is timid, don’t scare her.”

All the ghosts who were caught, “Are you talking nonsense?”

Just when everyone was waiting for Master Wei to cancel his marriage with his nominal fiancée, they actually waited for the news of their engagement.

Outside the nickname, Master Wei married Miss Feng’s family.

Impossible, Mr. Wei is ascetic, mysterious and low-key, never letting women come within one meter of him.

Master Wei was full of smiles, “Nian Nian, where do you want to go to catch ghosts tonight?”

- Description from novelbuddy