Wei Zile (played by Zhang Yikang), the real culprit in the tiger killing case, was brought to justice and the matter came to an end.Senior Inspector Xu Junsen (played by Chen Zhanpeng) of O Ji Group A and Senior Inspector Shen Weili (played by Huang Zhixian) of O Ji Group B continue to solve many strange cases.The two investigated a serious case of international killers ravaging Hong Kong. They used supercomputers to search for clues in the Internet and successfully solved the case. However, they unexpectedly discovered that before Zi Le was arrested, he had sent encrypted messages and huge amounts of cryptocurrency to the dark web, which was apparently hidden.A huge conspiracy!Immediately afterwards, a “Mysterious Man” appeared in Hong Kong planning a large-scale destruction, and the “Mysterious Man” was related to the image of Zi Le.Junsen and Weili have to completely decipher the message as soon as possible, and at the same time they have to wrestle with “Mysterious Man”, and the outcome will be reversed again...