Su Yu, an ordinary spirit-plant farmer, unexpectedly obtains the Everything Smelting and Synthesis System. He originally hopes to live a peaceful life farming, but soon becomes entangled in sect power struggles and the schemes of hypocrites from the Immortal Realm. Using the system, he transforms low-grade medicinal herbs into immortal pills and discarded flying swords into Shanhai mecha. While pretending to be weak to catch his enemies off guard, he gradually uncovers the truth that the vast Shanhai wilderness world has been imprisoned by the Immortal Realm. Facing invasions from other realms and a catastrophic calamity threatening heaven and earth, Su Yu leads his Shanhai Mecha Legion, using his cunning strategies and overwhelming strength to overthrow the hypocrites' rule and defy fate.