Synopsis:
After the victory of the Anti-Japanese War, Gu Yaodong (Li Yifeng), a senior law student who grew up in a Shanghai alley, graduated from university with the ideal of “supporting justice and protecting the people” and became a policeman as he wished. However, Gu Yaodong, who had just entered the workplace, was not only squeezed and suppressed by his colleagues in the police station, but also involved in the fierce struggle between the Communist Party’s underground intelligence network and the Kuomintang police.

In the chaotic times, Gu Yaodong had to make a choice that was loyal to his beliefs in the confrontation between justice and injustice. In the end, with the help and training of the Shanghai Underground Police Committee of the Communist Party of China, with Xia Jicheng (played by Wang Longzheng) and Shen Qinghe (played by Jin Chen) as the backbone, he fulfilled his ideals during the revolution and also gained valuable love.