During the Wang Puppet Regime during the Anti-Japanese War, Lu Feng, who grew up in an orphanage, was ordered to go undercover in Unit 76, but his identity was almost exposed because of the suspicious Shen Xiao. In the end, he successfully went undercover in Unit 76 with his superb wisdom and became the highest-level agent. However, he did not want to be the enemy of Chen Xi, whom he once loved. The two people who loved each other experienced various misunderstandings and finally confirmed each other's identities. They cooperated with each other in several secret activities and completed a series of secret tasks. During the action, Lu Feng gradually realized the darkness within the Military Control Commission and the disputes over power and interests. After experiencing the betrayal of his mentor and the murder of his relatives, he abandoned the dark and joined the Communist Party of China and became an undercover agent of the underground party of the Communist Party of China in the Military Control Commission. He worked closely with the organization, fought with the enemy in wisdom and courage, set up exquisite traps and traps, experienced the baptism of love, family affection and friendship, and won a turning point for the final victory of the War of Resistance.