In the 1960s, China Hong Kong was a mixed and chaotic place. The Royal Police under the British rule were greedy and even colluded with the underworld to plunder the people. Young detective Rello (played by Andy Lau) is full of ambition, carefully maneuvering between the British and Chinese superiors, and sees every opportunity to climb the mountain of power. In a certain fire incident, Lei Luo took a fancy to Wu Shihao (Den Yen), who dared to fight and kill. Wu Shihao, who came from Nanyang, was very upright and willing to serve his brothers on both sides. He relied on his enterprising spirit to establish his position in the underworld, and at the same time, he used his friendship with Lei Luo...