Lin Ye is humiliated for touching his cousin's motorcycle. He builds his "Iron Donkey", wins a bet against his cousin, and regains his dignity. He is rejected by the local racing team, but completes an impossible cross-country race, earning a spot. He works odd jobs while training and modifying his bike, climbing to provincial podiums, separated from his girlfriend due to his poverty. Three years later, Lin Ye stands at the international motocross championship, ready to rev his engine!