Reborn: Apocalypse Empire

Protagonist Aiden is reborn before the zombie outbreak. With tens of billions in funds, he buys an abandoned Scam Compound and turns it into an apocalyptic fortress. He stockpiles supplies, purchases weapons, recruits the Special Forces, develops a vaccine to fight the zombies, defeats the Doomsday Legion and a mysterious organization, and finally allies with an alien civilization to rebuild human civilization and venture into the cosmos.