MTL - Rebirth 1999: Opening the Age of Black Technology - Chapter 11 Lighting up the tech tree is equivalent to opening a blind box

In the eyes of outsiders, Yan Ruxu’s conditions are extremely good: good looks, high education, a high salary, and a high position, but there is a fatal flaw: she is divorced, with a three-year-old child. Yan Ruxu didn’t care what others thought of her, she just wanted to raise her son well and live her own life.

- Description from Novelupdates

Sam Sanderson is envied by many for his job, however he himself didn't seem to like it much.

Due to his expertise in nanotechnology he was tasked with monitoring the state the Valkyries, humanity's strongest weapons who all just happen to be made into gorgeous females.

Forbidden from even touching any of them, Sam spends his days in agony watching flowers he couldn't hope to touch. However one day all of that seemed to change.

In the fourteenth year of the doomsday like a holographic game, Mo Ran, the top dead master, was cast aside by the three major races of humans, orcs, and elves.
Genocide? betray? Assassinated? This time, as long as I’m here, it’s impossible.
Humanity? Elf? Orcs? Take mine and return it, eat mine and spit it out, be prepared to pay the price!
Demining:
1. Gamification of doomsday is impossible, gamification of life is impossible, and gamification of doomsday is even more impossible. Don’t point at the background bar.
2. Both the heroine and the heroine are not good people. Everyone has different positions. They serve the plot. Don’t point at the hero and the heroine.
3. The author is glass-hearted, and all kinds of abuse will rebound ten times, don’t point at the author!

Content tags: Rebirth Doomsday Games online games Shuangwen
Search keywords: Protagonist: Mo Ran ┃ Supporting role: Ming Yuechen ┃ Others: doomsday, holographic, strong
One sentence introduction: As long as I don’t die, you are all scum.
Conception: In online games, no matter what adversity, as long as you persevere, you can win.

- Description from novelbuddy

After 2000 years has passed, the ruthless demon lord has just been reincarnated! But his aptitude at an academy for nurturing candidates for demon lords is, “Inept”!?