During the war-torn Republic of China, Yi Xiao, who was studying in Japan, had to return to China to inherit the family business due to the sudden death of his father. In order to avenge his father's murder, he had to bury his hatred deep in his heart and marry his childhood sweetheart, Lin Tang, a typical traditional Chinese lady. Before returning to China, he had already been trained to join the Central Unification Committee and became a secret worker of the Kuomintang. When he returns to China this time, his main task is to use his existing identity to enter the Japanese interior, bury his identity as a member of the Central Unification Committee, collect intelligence, and assist other comrades in completing their tasks. During the mission, he met Gu Lianmeng, who was known as "killer without batting an eye" in the military command, and regarded him as his only spiritually trustworthy friend. By chance, Yi Xiao reunited in prison with Wen Ning, whom he met and fell in love with while studying in Japan. But to his surprise, Wen Ning was actually a member of the Communist Party... In the era of ruthless gunfire, revenge for killing his father and patriotism, Yi Xiao firmly made his own choice and devoted his strength to the Anti-Japanese War with many comrades...
Purpose: To show the difficult conditions and inner determination of latent workers during the Anti-Japanese War