In 2010, Hong Kong Police Senior Criminal Intelligence Inspector Zhuo Kai (played by Michael Miu) went to Bangkok, Thailand to investigate the transnational drug trafficking line with a lurking undercover agent in the local area.Unexpectedly, during the process, the leader of the Jiyun Gang, Pak Key and his subordinate Le Shaofeng (played by Zhou Baihao) suddenly intervened and disrupted the plan.Zhuo Kai and his party encountered a carefully planned explosion when retreating, causing other undercover agents to die in the sea of fire.After returning to Hong Kong, Zhuo Kai was disheartened and intends to resign.At this moment, the leader of the largest community in Hong Kong rose to the death of Xiao Wall. His former comrades faced each other with swords, and a war was about to break out.On the other hand, senior inspector Li Ruiquan (played by Zhang Zhaohui) was afraid that the five undercover identities within Changxing would be exposed, and in desperation, he deleted the undercover file.
In order to find the lost undercover agent, Zhuo Kai and others once again escaped into the bloody storm...