Descendant of Sloth - Chapter 12: The Hidden Sanctum

The main character is reborn as a character from a game he played in his previous life. This character falls into ruin along with the villainess, spending the last of their years together. A man named Kururi Helan.

Ye Fan accidentally obtained a billion crystal technology system, and since then, he has become out of control.

Android: You do n’t even have a mobile phone system. I want to make it impossible for you all!
Ye Fan: Sorry, I researched it out, it seems to be more powerful than yours!
BMW Benz: Our engines are famous all over the world!
Ye Fan: Sorry, I do n’t have an engine, I only have magnetic levitation, and the speed is only a few times that of yours. Do n’t worry, take your time!
…
Enemy: Is he still human?
Who can stop this!

- Description from Qidian

Wang Yi gets a key, opening a door in 2022 will lead to 1982, and opening a door in 1982 will return to 2022.

Two very different great eras appeared before him:

Abundant dietary protection, developed industrial products, miraculous medicines, and explosive information, this is 2022.

Simple folk customs, rich wild resources, scattered antiques, and treasures of the age, this is 1982.

Traveling between these two eras, Wang Yi didn’t think much of it, he just wanted to live a good life.

- Description from novelbuddy

Warning: This novel contains explicit adult content, violence, and a ruthless anti-hero MC. Read at your own risk.I was the strongest player in the world—until they betrayed me.When I woke up, I wasn’t a player anymore. I was just an NPC. A nameless mob, doomed to be farmed for EXP and discarded like trash.But then, I heard it:(You have been killed.)(Unique Skill Activated: Infinite Resurrection.)(Each death makes you stronger.)Every time a player slaughters me, I steal their stats, their skills, and their power. I evolve beyond the system’s control, beyond the limits of this world.They thought I was nothing.They thought they could use me, farm me, erase me.Now, I am the final boss—and I will make them suffer.On the battlefield, and in my bed.They will submit. One way or another.