Inside the Cave of Obscenity - Chapter Volume 9 1: The Hero’s Return

Xiao Ze, who was dedicated to the people and vowed to become a generation of Ming Jun, accidentally fell on a little lady.
The little lady was born beautiful and lovable.
So Xiao Ze accepted his life and got the name of fear.

ps:
①The male protagonist has no concubine, and he is dedicated to serving the country.

- Description from novelbuddy

A turn over of the geocentric Yanlong living in the core of the earth.

It completely destroyed the human scientific and technological civilization that had been developed for thousands of years.

With the return of extraordinary power, the emergence of extraordinary creatures, the fusion of multi-dimensional planes.

Human civilization has entered the era of beast-fighting.

At the core of the earth star, the terrifying head of the earth core Yanlong sticks out.

Above the floating clouds, the Wuhai Phoenix Bird revealed its slender and gorgeous tail feathers.

At the bottom of the Dead Sea, the Vast Sea Dragon Whale swings the body of Pang Ruo Land.

At the end of the earth, the devil wolf chases the blazing sun that never goes out.

Ordinary people who were born in the old era and grew up in the new era were reborn ten years ago.

Unpredictable and able to see through the potential of the beasts, he started a road to collect the beasts of the gods.

All stories have to start from that late autumn ten years ago.

- Description from novelbuddy

Damien Julian is an 18-year-old loser, who has been bullied and mistreated his entire life, at home, he has to deal with his abusive father, and at school, he is constantly been bullied by delinquents, and to make things worse he is always looked down upon by his peers, till one day a mysterious screen appear before him as it said.

[The world has seen the lingering evil in your heart]

[Would you like to be one of the nine demon kings of this world]

[If so what are you willing to sacrifice?]

In the heat of the moment, Damien made a deal with the world, that he would give up everything he owns, or do anything it wants, and in exchange, he shall be reborn as a new Demon King, and what the world required from him as payment was.

[In exchange for power, become a slave of the world, and act as an anti-body for all eternity]

At that moment, Damien agreed, but little did Damien know, that becoming a slave to the world meant he has to be its immune system, what that entail is, that anything that threaten the world must be destroyed even if he has to wipe out humanity, to save it, or assassinate historical figures to bring fort balance or even manipulating events that can potentially end the world, to save the world, this is the story of a necessary evil, not the story of a hero who cares for others.

Those people killed her grandmother, murdered her younger brother, trampled the people she deeply cared about, and even took her own life.

It was because she trusted her ambitious stepmother and half-sister;

because she mistakenly believed that womanly virtue is to have no talent;

because of her noble status and origin….This is what caused her death.

Buried in river water, Ouyang Nuan, gritted her teeth and spoke, “I, Ouyang Nuan was wronged in death. Even if it takes forever, I will become a devil, and in the next life, will not let you off!”

When she once again opened her eyes, Ouyang Nuan was sent back in time to when she was twelve years old. Around this age, her forehead was scarred, her brother fell into the water, and in three years she will be married…

In this life, she will try to change everything to guard and protect those she cares for from those with treacherous intentions. She will live a glorious life!

- Description from Novelupdates