Supreme Harem God System - Chapter 8: A Predator's Grin.

A man betrayed by a comrade dies a wretched death as a third rate swordsman. His existence, his life, his emotions are all a nuisance in the eyes of society. But wait… What’s this green skin? Reincarnated as a goblin? Wait, I went back in time as well?

[Mature Content!]In the heart of a bustling metropolis where ambition and dreams collide, Ella, a talented yet struggling artist, finds herself facing a crushing blow. Her world shatters as her ex-boyfriend exchanges vows with her former best friend, a betrayal that leaves her feeling humiliated and lost.Desperate for a change, an escape from her heartache, she impulsively agrees to a marriage of convenience with Damien Stone, a mysterious and enigmatic billionaire CEO. Damien, needing a temporary wife to appease his demanding board of directors and secure his position, sees the arrangement as mutually beneficial. As they enter this calculated agreement, both with their own hidden agendas, an unexpected spark ignites between them.Amidst the carefully constructed facade of their marriage, a genuine attraction blossoms, challenging their preconceived notions and altering the course of their lives in ways they never imagined.

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

This world is not only as the public knows it; there is an underworld that ordinary people don't encounter.Government agents handle troubles in the shadows, while corporate assassins privately deal with issues.Assassins, mercenaries, arms dealers, and spies exist, along with a dark web that ties this world together, and tycoons who attempt to control everything with money.Gao Yi entered the underworld, unbeatable in close combat, carving out his own domain.But there are guns in this world. Beyond seven steps (close combats), guns are faster.Within seven steps, guns are both accurate and quick.Only within three steps does Gao Yi's punch become faster.Unable to beat them, he chose to join them, aiming to rule them all.To rule everything, become the king of killers in the eyes of mercenaries, the king of spies in the eyes of assassins, the king of killers in the eyes of spies, and the king of intelligence in the eyes of arms dealers.Until he is crowned king by the entire underworld, Gao Yi is the ultimate firepower.