Heaven's Greatest Professor - Chapter 50 Calamity

Riding out the apocalypse on a tropical island isn't exactly a vacation. When mana arrives on Earth, Coop finds himself isolated in paradise with only one real option to survive. He needs to claim a civilization shard and level up. Coop maximizes his chances by carefully selecting a class and committing to progression. He’ll need to grind thousands of monsters to compete on the system's leaderboards while upgrading his settlement to represent the factionless.

Have you ever thought that the state of the world as it presently is, could revert to the laws of the ancients? When a series of strange incidents beginning with the disappearance of his friend led Luo Yuan to question the possibility of an apocalypse, he becomes embroiled in the midst of a global-scale chaos.

Evolution has turned the flora and fauna of the vast and bountiful Earth into something that had never been seen before. Coincidentally, the all-dominating Homo sapiens have ended up at the bottom of the food chain. From mystery to crisis, will Luo Yuan discover a means of saving humanity by racing to the top of the food chain? Or will he strive in accordance with the law of the jungle? It is the dawn of an age of the survival of the fittest.

- Description from Novelupdates

For others it takes dying and reincarnating for them to get a system but what happens when you get one without dying?

Aron Michael is an average student set to graduate within a week, but he was expelled for a random reason. Due to that, he had heavy student debt and no diploma to help him earn the money to pay it back. But one day he got a system that called itself the [Advanced Tech System].

Follow the story to watch him develop from your average Joe to him being the owner of the largest company in the world.

“If I were ever reincarnated in another world, I’d be the ultimate villain.”That was the last thing Ace joked about before getting hit by an out of control ambulance–ironically, while saving his best friend.Truly, Fate has a twisted sense of humor.Now Reincarnated in a fantasy world, Ace isn’t a chosen one, a prodigy, or a hero. He’s a background nobody—an extra in a story already set in motion. Weak, talentless, and scorned by society, his new life seems doomed to follow the same path as his last: forgotten and meaningless.Destined to be killed off early in the plot, With no noble bloodline, no rare mana affinity, and a world stacked against him. Ace must rise from the ashes of his failure and break this tradegy, the only way he knows how.But Ace isn’t the same person he used to be.Armed with wit, ambition, and a twisted sense of justice, he refuses to bow to fate. If the world wants a villain, then a villain it shall get. He’ll climb the ranks, topple the so-called heroes, and make sure the world never overlooks him again.This time, the extra is writing his own story and it starts with CHAOS.But as he treads the line between fiction and reality, a bigger question looms—Was his reincarnation really an accident?