"Introduction to the episodes of 'Secret War', Watch 'Secret War' online, Download 'Secret War' video."

The investigator of the Security Bureau, Liu Zhijun, is tracking the overseas spy "Cheetah". As Cheetah is about to board and leave the country, Liu Zhijun discovers evidence left behind by Cheetah in the airport toilet when extracting a micro hard drive. The data hard drive carried by Cheetah is opened, simultaneously activating its countdown self-destruction system. The public security bureau's cyber expert, Pang Jian, is entrusted with the urgent mission of cracking the hard drive password, uncovering a secret document related to a satellite.