a new type of drug has appeared in hong kong city, which has led to the armed drug smuggling case two years ago, and the clues point to hongtu group. after the transformation, lu yunlong was ordered to investigate undercover and rescued the group's chairman li hong and gained trust. he found out that the second-in-command chen biao was the murderer who killed his teammates back then. he joined hands with undercover xu li, and went through a life-and-death battle with drug dealers, and finally succeeded