This film uses the process of a Hong Kong policeman from an ideal youth to a generation of heroes to reflect the social problems of Hong Kong in the 1950s and 1960s. In 1949, the passionate young man Lei Luo (played by Andy Lau) became a policeman. At that time, the Hong Kong police were not paid well, and the unspoken rule of the police collecting protection fees from merchants became popular. Lei Luo was unwilling to go along with them, and was excluded by his colleagues. He also offended the powerful Inspector Yan Tong (played by Qin Pei) and faced the danger of suspension. However, Inspector Chen Tong (played by Guan Haishan) secretly admired him and protected him. Lei Luo and the daughter of the grocery store owner, Axia (played by Qiu Shuzhen), were in love with each other, but Axia's parents did not want their daughter to suffer with him and obstructed them in every possible way. Lei Luo drank to drown his sorrows and went to the casino of the underworld to make trouble. He was beaten. Thanks to Inspector Chen Tong's rescue, he helped him raise a betrothal gift of 50,000 yuan. However, the fire in Tung Tau Village, Kowloon in 1951 burned Lei Luo's dream. Lei Luo's family managed to escape, but A Xia's family was burned to death, and A Xia herself was never heard from again. In the late 1950s, Lei Luo experienced factional strife in the police force. After several ups and downs, he gradually adapted to the Hong Kong police and became adept at collecting protection fees. He was fortunate to marry the daughter of "Big Fish" Bai Fanyu, the beautiful and spicy Bai Yue'e (played by Zhang Min). With the strong support of his father-in-law and his outstanding performance in suppressing the Kowloon riots in 1957, he was promoted to inspector general. As inspector general, Lei Luo standardized the system of collecting protection fees in the area, reduced conflicts among all walks of life, and was highly regarded by his superiors. Coinciding with the retirement of the inspector general of Yau Tsim District, Lei Luo and Yan Tong both became strong contenders for this position. The two took action separately, and the situation was turbulent. At this time, Lei Luo unexpectedly met a person who shocked him...