On the eve of the September 18th Incident, CCP agent Song Yanqiao was sent to Shenyang to carry out two secret missions: finding Yan Hongguang and rescuing the arrested Shenyang branch secretary. Unexpectedly, he encountered various problems before he even started. In order to find out the truth, Song Yanqiao teamed up with peripheral member Shu Jie to fight wits and courage with his mortal enemy An Gu. After the September 18th Incident, Song Yanqiao found Yan Hongguang in Harbin, but Yan Hongguang died in front of him. In order to protect his friends, comrades, loved ones and the great motherland, he decided to unite various patriots to form an anti-Japanese armed force with different styles, and repeatedly made remarkable achievements. But as the war situation in the entire Northeast deteriorated, Song Yanqiao had to face the choice of life and death again.