I Have a Mansion in the Post-apocalyptic World (Web Novel) - Chapter 1519: Door

Second Awakening? A System? Having lost the battle of the Dark Catastrophe to the demons—spawns of the Dark Gods— humanity is given a chance at making things right once again. Born as a twin into a family of high ranking talent awakeners, Damien Terrace is met with trouble when it is his turn to perform the ritual. After awakening the E-Rank Summoner talent, Damien loses everything to his twin. Exiled by his father to perish away from them, Damien goes through a second awakening that changes the play field for him. Ding! [The God of Summons is furious and has blessed you with a system!] [You have fused with the Mythics Summoning System—A system that only allows you to summon mythical beasts!] [Obtain nineteen Magic Essence Cores to boost your core to the next level!] [Slay 200 more demons to unlock another summon!] Damien’s only option is to evolve!

They stole his future. Now, he’s rewriting reality.Ryan was at the top—champion of the world’s biggest VRMMO, but one wish changed everything.“I wish I could start over.”The Orb of Wishes granted it. Literally. Time snapped backward. The world unraveled. And Ryan woke up years in the past, holding his younger sisters close in a rotting apartment, broke and desperate.This time, he’s not starting from scratch.He remembers it all. Every hidden boss. Every bugged quest. Every game-breaking secret. While the world waits for the launch of Kingdom Forge, Ryan prepares to tear through it like a storm.But when he logs in, something glitches.His old character is locked. His class is reset. His power? Supposedly gone.Then the system flashes something strange:[Access Granted: Legacy Bank Synced][Warning: You were never meant to exist.]Ryan grins. He doesn’t need a strong class. He doesn’t need fair odds. He has what nobody else does—endgame knowledge in a beginner’s world, and an account holding gear, gold, and exploits that broke the game once before.He’s done being a pawn.This time, he’ll become the glitch the system can’t contain.

Great Cultivator Chen Fan had failed his Tribulation period, but after a dream, he had returned to Earth, when he was young, five hundred years ago.

“In my past life, I reached the peak in the universe. I looked down upon the myriad of worlds, but with no one accompanying me. In this life, I wish for both.”

- Description from novelupdates

An ordinary (?) grandfather, Choi Chuntaek. In an effort to protect his granddaughter, he started the virtual reality game 'Arkstar.'

Then... he accidentally obtained a legendary class?