Set around the founding of the PRC, the story follows CCP undercover agent Zheng Chaoyang as he battles KMT operatives. After his cover is blown at the Peiping police station, he escapes with a critical list of KMT spies. Returning to Peiping post-liberation, Chaoyang faces a new challenge—elite KMT spies led by "Phoenix," who is revealed to be his estranged brother, Zheng Chaoshan.

Zhang Yias Zheng Chaoyang / 郑朝阳
Huang Zhizhongas Zheng Chaoshan / 郑朝山
Pan Zhilinas Bai Ling / 白玲
Xue Jianingas Shang Chunzhi / 尚春芝
Zhang Junyias Hao Pingchuan / 郝平川
Wang Xiaoas Zong Xiangfang / 宗向方
Huang Pinyuanas Luo Yong / 罗勇
Li Tiannuoas Qi Lala / 齐拉拉
Guo Yongzhenas Duan Feipeng / 段飞鹏
Gao Liangas Duo Men / 多门