In the 1960s, Hong Kong, China, was a place of chaos and confusion. The Royal Police under British rule were extremely greedy and even colluded with the underworld to plunder the people. The young detective Lei Luo (played by Andy Lau) was ambitious and carefully dealt with the British and Chinese superiors, and seized every opportunity to climb the mountain of power. In a certain gunfight, Lei Luo took a fancy to the daring and killing Wu Shihao (played by Donnie Yen). Wu Shihao, who came from Nanyang, was righteous and willing to stick a knife in his brother's ribs. He relied on his pioneering spirit to make his own position in the underworld, and at the same time, he became famous by helping Lei Luo. In the end, Lei Luo and Wu Shihao, who were both bloodthirsty, became heavyweights in charge of the white and black roads respectively. In the process, the brothers gradually had differences. When the storm comes, everything is about to change...