Zhao Dazhu has been a key technical expert for twelve years. In previous years, his year-end bonus was 120,000 yuan, but this year he receives only 1,200. The newly appointed factory director, Sun Mingde, favors his own relatives, awarding a 100,000-yuan bonus to his utterly incompetent nephew while stealing Zhao Dazhu's technical achievements. Heartbroken, Zhao Dazhu takes leave, and the factory's production line is destroyed by incompetent operation. Instead of taking responsibility, management fabricates evidence and falsely accuses Zhao Dazhu of demanding 8 million yuan in compensation. Zhao Dazhu hires a lawyer and presents a complete chain of evidence, exposing the corruption and fraud behind the scenes. All the wrongdoers are arrested, and he clears his name while defending the dignity and justice owed to ordinary workers.