The real killer of the tiger killing case, Zile, was brought to justice, and the matter came to an end. Detectives Junsen and Wei Li continue to solve numerous strange cases. The two investigated a serious case of an international killer wreaking havoc in Hong Kong. They used a supercomputer to track clues on the Internet and successfully solved the case. However, they accidentally discovered that before Zile was arrested, he had sent encrypted messages and a huge amount of cryptocurrency to the dark web. Obviously, there was a huge conspiracy! Then a "mysterious man" appeared in Hong Kong to plan a large-scale destruction. The "mysterious man" seemed to be related to Zile. Junsen and Wei Li had to completely crack the message as soon as possible, and at the same time they had to wrestle with the "mysterious man". The ending was reversed again and again!