Martial King's Retired Life - Chapter 61Book 15:

Mu Yu, who had just started university, unintentionally downloaded a mysterious hand tour and was brought to a strange and bizarre world, becoming the first player of the ‘Mystical World’.

By chance, Mu Yu joined an ancient sect that had declined for a thousand years. He successfully repaired the sect’s supreme technique, the Secret Manual of Space and Time, and became its spacetime descendant.

After three months, players officially logged into the Mystical World game. Mu Yu was already the pride of South Sky.

Two years later, when the players had grown up, Mu Yu had already become the most dazzling Saint under the starry sky.

….

At the foot of the Misty Cloud Mountain, a young girl in a white dress nestled in Mu Yu’s embrace as she cried, “I, Nalan Yanran, would rather die than marry that young master of the Xiao family. I only wish to marry you in this life.”

“Ding!” You have successfully triggered a 3-star mission! to help Nalan Yanran go to the Xiao family to end the engagement! ”

“Wait a minute, this script isn’t right. Can’t we just not do it?” Mu Yu felt like crying.

“Either way! Either die! ” The System pulled out a 10m long broadsword.

“Stop, can’t I do it…” Mu Yu submitted.

- Description from Novelupdates

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 powerful enemies by 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 …

Wanting to live in the Devil’s world is hard! Wanting to live in the Devil’s world as a human is harder! Wanting a human to be the devil’s son-in-law is hardest!

Let us see how a small otaku uses power and strategy step by step starting from an ordinary human to writing a legend as the devil’s greatest son-in-law.

Due to investigating an arms case, he was forced to become a gigolo, from then on, the cute little loli, the sweet and pure young married woman, the cold and aloof CEO beauty, and all kinds of other beauties surrounded him.

She married a driver she just met. However, the last thing that had ever come to her expectation was that her bridegroom was no other than the most mysterious billionaire in the city. This marriage brought her baby twins. Thus, she worked harder to support this family. She was the queen of the entertainment circle. When she met the king who dominated the business world, she finally knew her husband’s true identity.