In the 1960s and 1970s, Hong Kong was full of corruption and gangsters. These were the most glorious days for Chan Wah (played by Lau Ching Wan), Laba (played by Lam Ka-lai), Mao Zai (played by Cheung Chun) and a group of brothers. Chan Wah was regarded as the leader of the "Thirteen Tigers of Tsz Wan Shan" and was arrogant. He also met the love of his life, Ke Rou (played by Jiang Yiyan), and spent the sweetest time of his life together. Unfortunately, the good times did not last long. Chan Wah was hunted down by the gang for private drug trafficking. Fortunately, with the help of the anti-drug team leader Harley (played by Louis Koo), who was both his enemy and friend, he escaped, but he could not escape the law. After being released from prison, his father passed away and his girlfriend Ke Rou disappeared. Chan Wah, who was extremely self-blaming, suddenly realized his past mistakes and determined to start a new life. He not only actively participated in youth drug rehabilitation work and won the honor of the Ten Outstanding Youths, but also brought Laba and Mao Zai back to the right path. He also often mediated disputes in the underworld, and was deeply respected by both the black and white worlds. After attending a drug rehabilitation seminar in Japan, Chen Hua and Ke Rou met again on the street. He was determined to rekindle their old relationship, but could he easily defuse his feelings?