Zaijiu and Shunying run a car maintenance company along the country road, and their livelihood is under threat in the face of competition from large car repair companies in nearby towns. One day, business suddenly came to the door, because a nail dropped by a truck in and out of a nearby construction site led to a flat tire of a passing car. Finally, Zaijiu, who had an income, had an idea to cast iron nails on nearby roads at night and raise maintenance costs, hoping to make a lot of money, but caused a series of unpredictable accidents.
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