The end of the world is coming, and zombies are rampant. Cheng Yuan was reborn and returned to three days before the apocalypse broke out, awakening the apocalyptic technology tree system. While others were still fighting with machetes, he had already built electromagnetic rifles; while others were still worrying about supplies, he had built a fully automated base. From laser weapons to mecha legions, from artificial intelligence to interstellar battleships, he rebuilt human civilization in the doomsday wasteland. In this life, he wants the light of technology to illuminate this dark land again.
