Rebirth; I Choose to Love You for an Eternity, my dear. - Chapter 56 - ; Uncle!

My name is Chen Huai’an, and I have cancer. I’m dying. Lately, I’ve become obsessed with a virtual girlfriend game. I top up my account to buy her cultivation techniques and magical artifacts. Even though I’ve emptied my wallet, I laugh like a fool. I always thought it was just a game—until one day, my virtual girlfriend sent me a pill. The next moment, the pill appeared in my hand… Am I… not going to die?!My name is Li Qingran. My cultivation has been crippled, my spiritual roots dug out, and I’ve been expelled from my sect. I cower in a dilapidated hut, waiting to die. I thought my life was over—until I met a mysterious senior who never shows himself. This senior heals my wounds and helps me cultivate. I grow stronger and stronger, eventually becoming the most powerful sword cultivator in the Cangyun Realm. I’ve heard that the spiritual energy in Cangyun is depleting, the Dao is dim, and an immortal from another world plans to merge their soon-to-revive realm with ours. An age of chaos and opportunity is upon us. Even immortals may face death in this struggle. I scour the world for traces of this senior. I want to protect him—and become his Dao companion!!!

Hell Ghost Wang Wannian is born again, smiling and proud!
What?
Are you a soldier, will the tank drift?
You are a master, can you give birth to dragons and tigers?
You are a superman, can you call the wind thunder?
Excuse me, I am not targeting anyone, everyone in my eyes, it is rubbish!

- Description from Uukanshu (translated)

As a successful villainous BOSS, in addition to having ideas and aspirations, one must also keep in mind three points:First, grow sneakily, don't act rashly (once a villain acts rashly, they basically won't survive past three chapters).Second, you're not a good person, so be ruthless (becoming more evil will make you three times stronger, while redemption weakens you by seven times).Third, remember the two points above. The moment you forget them, your end is probably on its way.

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.