The captain of the Security Bureau reconnaissance team, Liu Zhijun, while leading his team in executing the arrest operation of a spy known as "Cheetah", unexpectedly discovered that what the other party intended to smuggle out of the country were the design plans for the "Stellar Signal Six" satellite. The Confidentiality Bureau received central instructions to collaborate with the Security Bureau and the Public Security Bureau to establish a special investigation team, with the head of the team appointed as Director Wu Mei from the Supervision Department of the Confidentiality Bureau. The investigation team conducted an investigation into the satellite research institute 322, but faced obstacles everywhere and made little progress. Meanwhile, foreign-based spy organizations also launched attacks on the network of Institute 322. With the help of Shen Weiguo and his son, the investigation team, trapped both internally and externally, successfully uncovered the spy Fang Yao hidden within Institute 322.