During the Wang puppet regime in the Anti-Japanese War, Lu Feng, who grew up in an orphanage since childhood, was ordered to enter No. 76 undercover to standby, but because of the suspicious Shen Xiao by nature, he almost exposed his identity, and finally successfully entered No. 76 with superb wisdom and became the highest-level agent member, but he didn't want to be the enemy of Chen Xi, who once loved, and the two people who loved each other went through various misunderstandings and finally determined each other's identities, and cooperated with each other in several secret activities to complete a series of secret tasks. Lu Feng gradually realized the darkness within the military system and the dispute over power and interests, and after experiencing the betrayal of his mentor and the killing of his relatives, he abandoned the darkness and joined the Communist Party of China and became an undercover agent of the underground party of the Communist Party of China within the military system. He worked closely with the organization, fought the enemy in a contest of wisdom and courage, laid out elaborate traps and traps, experienced the baptism of love, family affection and friendship, and won a turning point for the final victory of the Anti-Japanese War.