MTL - Online Games: 10,000-fold Increase at the Beginning! - Chapter 107 Battle of Tianjiao

The world had changed when the System arrived, alongside the Cataclysm that filled the world with monsters. The technology was gone, replaced by classes and skills that allowed the people to fight back. When Devon ended up as a Blacksmith, a class that didn’t grant Intelligence, he had to face the reality, that his old career that he loved - mathematical sociologist - was over. Instead, he had ended up as yet another discarded member of the production class, overshadowed by the existence of the System Shops to the point of total marginalization. But, what if all he needed was to reapply his scientific thinking to the System...

In the year 3000, the Earth shattered and it was torn open by a rift between realms that unleashed ancient beasts, magical chaos, and apocalyptic storms. Civilization crumbled, giving rise to a brutal new law: Tame or be Torn Apart. Beast Tamers, bonded to mutated and other creatures now rule what remains of the world through strength, savagery, and guild-driven power.Kelvin, a scavenger scraping by in the ruins, lives in the shadow of these warlords until he unearths Xerion, the End-Tyrant, a legendary primordial beast sealed beneath the earth. Bound by a forgotten bloodline and a cursed contract, Kelvin inherits the Sigil of the Overlord, thrusting him into a war-torn world where survival is no longer enough.He was hunted by guilds, worshipped by outcasts, and pursued by enemies both human and monstrous, Kelvin must rise from nothing to either unite or destroy what’s left of civilization. As forbidden powers awaken and ancient truths unravel, one man and his beast stand poised to reshape the fate of a world teetering on the edge of annihilation.

A teenager who unexpectedly gets transported to the modern world from ‘the world of the immortals’ . He finds himself in the body of an ordinary guy. He wants to go back to his world and for that, he will have to practice to get stronger and investigate the reason why and how he crossed through to this world.

I fell into a game world out of nowhere with an instant kill skill.
And then somehow, I became a bigshot.