I Met The Male Lead In Prison - Chapter 242

In 2036, mankind landed on the fluorescent Mars for the first time.

In 2052, the first World Budo Tournament will be held, which is also the world’s highest fighting event, and the world is enthusiastic about it.

Xu Jingming, the world’s top player “Gun Demon”, chose to retire when he was twenty-six years old, with an injury left by the competition…

A turbulent new era has begun!

- Description from novelbuddy

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.

Reincarnated without memories, given a second chance as a chimera with a limited lifespan. Leon struggles through his strange new life. He attempts to improve his dungeon and evolve himself to live longer and become the strongest Dungeon Master—no. The Dungeon Overlord.Helped by his Dungeon System: the mysterious Ifrit, Zafira a Level 100 Succubus Queen, and his band of trustee goblins. Leon aims to overcome his limits, survive and reach the pinnacle of the world. Whether through trade, domination, or tricking the hero's beautiful party members into becoming his private mercenaries.Leon will face the weakest and strongest beings in the magical world of Umbra and surpass all!

Chen Mo a game designer got sent to a parallel world with advance technology but undeveloped game concepts.