After a global natural disaster struck, the world turned into a mechanical wasteland. Zhang Yi, who accidentally traveled through time, woke up and became a scrap recycler. A damaged repair map suddenly lit up in the pupil of his left eye - it was the strange pupil left by the "spiritual craftsman" of the old world. When everyone was selling the damaged mechas they picked up as materials, he was the only one who could see the complete outline of the divine armor from the mountain of garbage. From rusty high-end engines to discarded biological exoskeletons, those special irises allow him to assemble unique combat machines out of nowhere. "The repair progress is 5%... Start scanning the power center... Warning, the enemy camp's 'Steel Flame City' mecha formation is approaching." Facing the entire Marauder Army, he was driving a dilapidated first-modified machine and slowly raised his hand, raising a friendly middle finger to the panicked enemies on the holographic screen: " Sorry, I just happened to find the core thruster of the 'Doomsday Fortress II' in the trash." When the last line of defense of civilization melted in the flames of war, an awakened person who could infinitely repair machines quietly turned into a daylight spark that no one dared to ignore in this doomsday sunset of iron and blood.