A violent gang that had fought with the six major crime groups three years ago has resurfaced, but this time the new gang derived from it is even more vicious. Tao Fei (played by Wang Chao), who took office in a misunderstanding, temporarily became the acting leader of the sixth group, and Ji Jie (played by Wang Qian), who had been transferred to the pre-trial department of the sub-bureau, also returned to the sixth group, Zheng Yimin (played by Zhang Chao), who was promoted to the deputy head of the criminal investigation detachment, and Yang Zhen (played by Ding Zhicheng), who is now the director of the legal department of the sub-bureau, - the new and old members of the sixth group re-collected evidence, and the criminal police defended justice, dignity, and honor at the cost of blood, cracked all kinds of serious cases, and finally wiped out this criminal gang. Practicing the oath of the police with practical actions.