Twenty years in the wasteland, top mecha master Lin Feng was betrayed by his close relatives and comrades. His mecha was dismantled, his core technology was taken away, and he was eventually killed in a wave of alien beasts. When he opened his eyes, he was reborn thirty days before the disaster! With twenty years of experience in researching and developing mechas and memories of surviving in the apocalypse, while others were grabbing instant noodles and hoarding supplies, he spent all his wealth collecting rare metals and melting scrap iron to make alloys. While others were surviving with cold weapons, he had used the first-generation mechas to fight his way out. From the tattered first-generation mechas to the ultimate god of war fused with the crystal core of alien beasts; from the lone mecha master to the steel overlord in charge of hundreds of mechas. In this life, he uses mechas as blades and artillery fire as shields to tear apart traitors with his own hands, defeat the tide of alien beasts, and defeat all apocalyptic forces! Anyone who bullies me, betrays me, or harms me will be crushed into powder by the torrent of steel! And what he has to do is not only to survive, but also to use the steel body of the mecha to protect all those he wants to protect, and to build a defense line for human survival in the wasteland!