Bu Sha - Volume 2, Chapter 3 : Light and Darkness

Chen Rui, an otaku from earth, is reborn into a human body in another world, who falls into the legendary evil, brutal world of the devil called Mozu where humans are treated as food. He has to survive while facing horrors of the devil, violent dragons and a variety of power enemies depending on a strange super system chip and his wits. Surrounded by Devil’s beauties such as black-bellied lolita princess, cold queens, violent dragons, charming poisonous devils …

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates

Arlan can go back in time by one minute, once per day.And every time he levels up, he can go back a little further.But, even with his growing power, Arlan has never been in more danger. Demon magic was never supposed to make its way into the hands of humans, and its original owners would go to any lengths to take it back.What to Expect:-Numbers. This is a LitRPG written by someone who loves LitRPGs. It won’t be overwhelming or confusing, but if you dislike the genre, this probably isn’t the story for you. Blue boxes ahead!-Meaningful progression. Characters are always working to grow more powerful, but doing so is difficult. Level-ups are hard-earned and bring with them meaningful change in characters’ abilities.-Tactical combat. Fighting is as much a battle of wits as it is a battle of muscle, after all.-No harems.

This novel is also known as Master Fu's Mysterious Darling Wife

She is the The Young Miss of Military family Shen, her face is peerless, her temperament is cold, and she is her family’s treasure, but isn’t accepted as one’s child by her mother;

He is The Sole Heir to the top giant Fu Family, his power is unparalleled, indifferent high-born, the captain of the mysterious military force, and the youngest commander-in-chief.

Because of her grandmother’s wishes, she married him at lightning speed. She thought that it was a marriage that she needed, but she didn’t expect to be greeted with his extreme pampering.

- Description from Novelupdates