The System Maker! - Chapter 15 - Cultivation!

[You have entered the dungeon at Gwachun Station’s 1st Exit.] When former high school student Kang Woojin finds himself returned back to Earth after being forcibly summoned to a foreign planet for 20 years, he soon finds that Earth is not the same, normal place as he once remembered it to be.

Ryu Han-bin, the main character who fell into a new world after being chosen as a ‘suitable person’.

Because of the error in the guidelines, the training is repeated endlessly…

He went from an ordinary student to a god-level master in manufacturing.
Continuously progressing, processing range from hundreds of meters to tens of atoms, processing precision from microns to nanometers to atoms and molecules, everything was possible.
Wassenaar Accord? The embargo against China? What we have banned are technologies that China doesn’t care much about. Most of the member states have to import technology from China, shouldn’t the member states have a meeting to discuss and bring in China as well?
Forbidden chip sales? Is there a mistake? We barely managed to maintain our low-end market with a large amount of subsidies, it’s already good enough that China didn’t initiate an anti-dumping investigation. President, are you sick?
Hmm, it seems like living cells can be processed precisely as well. Do you need to refine the cancer cells that you are spreading out?

- Description from Novelupdates

[Warning: Mature Smut Content!]Having incredible powers, diving into dungeons to hunt monsters, and being celebrated as an idol worshiped by countless people—that’s what it means to be a Hunter. Becoming one is the ultimate dream of all people. But not everyone can achieve it, because the first requirement is awakening.Adam, a student at the world’s most prestigious Hunter Academy, failed. Powerless, he became the only ordinary person among them, mocked and bullied without end.Home was no better. His stepmother and stepsisters treated him as less than garbage. Adam’s life was nothing but hell with no escape. Until one day, as his stepsister trampled him, something inside finally awoke.He unlocked a forbidden power: the ability to stop time, along with a perverse System that had only one purpose—Revenge.From that day on, everything changed. One by one, he punished those who tormented him, bent them to his will, and began building a guild of beautiful women who submitted to him.This is the rise of Adam, the Depraved Time Lord.