I'm Repairing Mechas in the Wasteland at the End of the World

Thirty years after the nuclear war, under the dome, humans survive on mutated food and projected greenery. Jiang He, a civilian boy in Area C, was so poor that he couldn't even afford mecha maintenance classes. Until he picked up a packet of old seeds and planted a disobedient sunflower - it didn't face the sun, but only faced the light tower. The light tower was shaken and people died, but the official said it was fine. But Jiang He's sunflower told him: the dome is going to collapse. Others rely on blueprints to repair mechas, but he relies on a plant to repair mechas. Others rely on resources to upgrade, while he relies on farming to upgrade. While the wealthy district was still fighting for power, Jiang He had already used a sunflower to pry open the secret of the entire dome. "What you are cultivating is mecha, and what I am cultivating is the root of this world."