MTL - Chronicles of Primordial Wars - Chapter 831 Who are you helping? !

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates

“W-w-w-welcome to the simulation zone.”“New user recognized.”“Proceeding to register...”“Please wait...”“Register complete.”“Welcome, user number 4956: Evan Rotewed.”In a world of mana, those without reserves for it gets left behind. Rules and regulations are set to categorize everything into neat piles, each promising the highest potential a person with mana can get. Starting his life at the rock bottom, Evan Rotewed swore he will rise above it all, even if he had to break the ironclad system the entire world holds close to its chest. Wave a hand to the broken reflection beyond the mirror of ones and zeroes. System Discord.

A mysterious natural phenomenon caused the Earth to be plunged into darkness. The world turned into an endless bloody chaos and mankind is on the brink of extinction…

After an accidental death, in order to continue to live, Gu Bai had to choose to go through various wonderful books to complete tasks.

Every time he became a variety of small cannon fodder inside the story, Gu Bai’s code of conduct when completing task is – by all means, don’t be inferior, don’t be shameless, don’t be upright… hold on to a golden thigh.

… N times after transmigrating

Cannon fodder: (angry contempt) … You’re already so powerful, why are you still shamelessly holding on to a golden thigh to deal with us!?

Gu Bai: (deadpan) That… holding and holding… got used to it…

- Description from Novelupdates