Red Envelope Group of the Three Realms - Chapter 3864 - -substitute

In a world where monsters dominate, and humans are but one out of ten thousand of the population, Gao Yang, having transmigrated to this world at the tender age of six and led the life of a normal boy until his eighteenth birthday, must seek the truth and survive against all odds—with the help of a mysterious system, a bottom-of-the-list Talent, and the companions he meets along the ways.

What is hidden under the facade of an ordinary city and its ordinary occupants? What are these different manners of monsters, and where is the line drawn between monsters and humans? Could relationship and love be true when all are merely playing their own parts?

Ride along on his journey and find out!

Official blurb translated from Chinese:

An orphan, Gao Yang transmigrated to a parallel world at the age of six, and he was given the gift of a loving family of five.

However, with the coming of his eighteenth birthday, Gao Yang found out by chance that this is no parallel world, but a strange domain where his family and friends can all be terrifying monsters! He almost got killed when he realized the truth, and he would, if not for the system and Talent he acquired at the last moment, Lucky—the longer he lives, the stronger he will become!

Now commenced the battle royale of a lamb among wolves…

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“Missus, time to fulfil your duties!” Mu Yuchen demanded as he pulled Xi Xiaye closer with his arms intimately wrapped around her waist.

It was a meticulously planned feast for the powerful. Her fiancé had knelt down on one knee and proposed to her sister instead. Robbed of her right to her inheritance, she was prepared for the Xi family to throw her to the wolves.
As she slipped away from her family that had turned their backs on her, she found him — Mu Yuchen, the low-profile and reserved noble that ruled City Z and led Glory World Corporation.

“Mu Yuchen, let’s get married!” He looked up at her, then suddenly stood up.

“Where are you going?”

“Let’s go. Any later and the civil affairs bureau will be closed.”

- Description from Novelupdates

After her parents had both died in an accident, she had to sign an agreement with him to save her family's company.

It was stated in the agreement that he would save her company on the condition that she would allow him to do whatever he wanted with her.

Just because she resembled the woman he had once loved, he had toyed with her a million times and tortured her in every possible way.

He humiliated her in front of others and then abandoned her. She had loved him, but had suffered.

It wasn't until the agreement expires that she finally ran away from him. By the time she left, she was already pregnant.

A few years later, she brought her adorable child back and became strong and cold-blooded. When they met again, he doted on her so much …

Going for a swim, she ends up in an ancient wild Beast World and ends up being brought home by a handsome wolf.