The film follows criminal police officer Cui Xun over half a century of investigative work. Alongside his colleagues, he solved numerous major cases while staying true to his original aspiration of 'serving the people.' This legendary detective not only witnessed the evolution of China's public security system but also stood as a living testament to the rise of New China.
| Actor | Role |
|---|---|
 Zhang YiCui Xun | Cui Xun |
 Ma LiNot listed | Not listed |