Before the liberation of Shanghai, Nationalist agent Zhang Rong is ordered to blend in with the captive workers of the Baotong Mill and wait for a chance to act. After the liberation, he returns to the factory, disguising himself as a far-left agitator and causing friction between the workers and management.
| Actor | Role |
|---|---|
 Wei HelingNot listed | Not listed |
 Wang BeiNot listed | Not listed |
 Gao YiyunNot listed | Not listed |
 Wu YinNot listed | Not listed |
 Fu BotangNot listed | Not listed |
 Lan WangNot listed | Not listed |
 Xie YibingNot listed | Not listed |
 Zhong ShuhuangNot listed | Not listed |
 Jiang TianliuNot listed | Not listed |