He Chenchuan discovers that his father suffered severe injuries due to a repair shop illegally installing substandard brake parts. To cover up the truth, the black-hearted factory director uses fifty thousand yuan to force his father to sign an 'operational error' agreement. He Chenchuan refuses to compromise, teaming up with the union to find the hidden accident vehicle and recover footage, completely exposing the factory's dark secret of using defective parts long-term. In the end, he successfully regains justice and opens a repair station that firmly upholds safety bottom lines.