Apprentice Lin Hao complains that his master, Chen Shouye, has a conscience when repairing cars and earns little money, so he jumps ship to an unscrupulous auto repair shop, using inferior parts as substitutes to make exorbitant profits. The inferior parts eventually lead to a major traffic accident, leaving Lin Hao imprisoned and full of regret. Meanwhile, Chen Shouye consistently sticks to his bottom line and craftsmanship, repairing cars with integrity, finally earning the respect of the world, and his small shop becomes increasingly prosperous.