Martial King's Retired Life - Chapter 81Book 15:

Victoria Garcia signed a slave contract, but accidentally fainted in bed!“Arnold Johnson, you are a monster! You said you could wait three years!” She complained!“I would be less than one if I didn't take an opportunity after it presents itself!”Then, on a certain night...“You're a scoundrel and a scumbag!” Xiu Xiangwan yelled on the verge of falling apart.“I could be worse if you dare to test me!”“...”Arnold Johnson is the second child of the Johnson family, one of the six top families of business magnates and owners of Johnson Holdings. Everyone says that he was affably evil and elegantly ruthless, and he was said to have seized an opening to engineer his own brother's death, hence inheriting Johnson Holdings!Victoria Garcia was the daughter of a family who now fell to dire straits, pawning herself off to Arnold Johnson to keep her mother out of prison...

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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From the age of 7, Qiao Qiao realised that her family wasn’t quite the same as her friends’ families.

Her father, dressed in all white, said, “Our girl should learn to cultivate immortality with me!”

Her mother, dressed in battle armor, said, “Our girl should train her body to protect herself!”

When discussing it, they decided to solve it with a duel outside.

Her brother secretly asked, “Qiao Qiao, do you want to be in the entertainment industry with me?”

Then, her brother was kicked out of the house by her parents. She prayed that he was okay out there. 

Qiao Qiao sighed. She was really worried about this family.

She silently collected mech building materials. There was no other way, if she learned how to use mechs, she would be able to get a good job. Unfortunately, her unreliable parents didn’t understand.

It seems like the burden of supporting this family was handed over to her.

- Description from Novelupdates

Her step-sister just died three months ago. Now, she insists on marrying Chu Lui, who is supposed to be her future brother-in-law, the mind behind the Chu Enterprise. The world is sure that she, the new bride-to-be, had caused her step-sister’s death in order to seduce him.