MTL - Martial King’s Retired Life - Chapter 3 . There are six doors with people in the center.

In a parallel world filled with pet beasts, people tame, train, evolve, and trade beasts.

“Married rich for three years with no child born. Just when she was finally cured of infertility and ready to give him a child, he brought home his pregnant mistress in high profile.

“”Get lost if you can’t get knocked up. Or do you want my son to be the last of the Mo family?”” her mother-in-law viciously cursed.

Her husband grimly shoved a divorce agreement upon her face, “”I’ve signed. Leave when you are ready.””
It was heard later that two men went physical in the city plaze of Ye City to win back the wife, with the two babies at the side fighting fiercely for their mom!”

- Description from Novelupdates

Evolution, it is the process with which the most fit for survival pass down their winning traits. What if this could be done on one animal, one object, one person, what traits would evolve.

...

Humanity has been entered into the grand inter-realm competition for sovereignty of all realms.

Darwin has been granted the gift of evolution

A lonely soul, which was placed under the care of the Lord Protector’s Manor, ended up having her lover stolen by the family’s eldest daughter and dying tragically the day before her wedding.

Somehow, she was reborn in the family as their 14-year-old first wife’s daughter, Ning Xueyan, with a startlingly familiar face.

Step by step, she will ruthlessly scheme to seek revenge as well as uncover the mystery of her tragic death.

Her former fiancee, the flirty crown prince and the bloodthirsty prince, will now bear witness to a vengeful Ning Xueyan becoming the peerless lady of her generation…