The supporting character's harem is very normal - Chapter 349 Saki’s revenge - The Demon Lord appears

In the year 3021 of the Western calendar, the last world war broke out and the earth was destroyed.
A group of survivors left their homes to settle on new planets. New races, new classes are born. Cities began to be built, countries rose one after another, conflicts between different races intensified, and social order was re-established…
The transformation from a survivor to an aggressor was but a moment.
This is a world where the strong are respected and the fittest survive.
Shang Ping was reborn from the earth in the 21st century to this planet. The moment he woke up, his fate had already begun to change.

Content Labels: Strong Soul Conversion Court Marquis Heaven’s Chosen
Search keywords: Protagonist: Shang Ping ┃ Supporting roles: Solan Edrich, Liu Xi, Austin ┃ Others: future time and space, battleship, interstellar war, rebirth, distant starry sky

- Description from novelbuddy

Carn wakes up from a vivid dream where he spent a thousand years as a gargoyle, guarding a demon lord's tomb.In this dream, he possessed supernatural powers, including the ability to teleport and instantly kill anyone within range who broke eye contact with him. Heroes, saintesses, adventurers, all fell before him.When he returns to his normal life, things take a strange turn. Carn realizes he still has the gargoyle’s powers, and the world he has woken up to seems different.But adjusting to the new reality is not the real issue. Carn brings back something nobody in this world has imagined. Not only he imports his powers to this alternate Earth, but he also carries over his gargoyle instinct and his hobby. He loves snapping human necks.Whether it's ordinary humans, explorers, super soldiers, cyborgs, mutated beasts, monsters, or mysterious entities from other dimensions, Carn eagerly anticipates snapping their necks, one neck at a time...In secret, of course.

“Master, the people from the Zhuang family have come to cancel the engagement.”

“My fiancé whose beauty was said to be capable of causing the downfall of a city, finally decided to throw me away?”

“I think so.”

“I want to see this legendary beauty, and confirm whether this bastard is as really great as people said to have no flaws in all 360 degree, a picturesque appearance however you see him; does he need me to help him open the corner of his eyes (Epicanthoplasty) or reshape his chin (Genioplasty)?”

“Actually, he didn’t come.”

“He didn’t? He didn’t even come to cancel the engagement? What a wicked b***h.”

“He definitely will get karma.”

- Description from Novelupdates

Do not judge others in ignorance within my presence.

Those who think to harm someone should be ready to be harmed.

Those who are open and respectful shall receive my kindness and respect.

Those who plot against me are seeking their own death.

This is true, for I am death… I am Lin Feng.

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Lin Feng tried to be the diligent and hard-working good guy. He Studied hard, did his best to make his family proud and not get into trouble, but when he saw a girl being taken advantage of, he had to intervene. He had been tricked, sentenced to 10 years in jail and framed for a crime he never committed, all was lost. If his life was over he would take those who ruined his life with him…

Suddenly he opens his eyes again. He is not dead, but alive in the body of the Lin Feng of a different world. This Lin Feng had been killed as trash of cultivation. This world where the strong had no regard for human life and would kill freely if they had the strength. Called ‘trash’ and thrown away, with vengeance in his heart he will rise to new heights opposing the will of heaven and earth.