Hongyan was a novel about the struggle of underground workers during the Chinese Anti-Japanese War. It mainly told the story of an underground worker named Li Hongyan carrying out a mission behind the enemy's back. During his mission, he constantly fought and negotiated with the enemy, using his wisdom and courage to protect the lives and property of the Chinese people. At the same time, the novel also described some other characters such as underground traffic officers, doctors, teachers, etc. They contributed to the Anti-Japanese War in different positions. The plot of the novel was full of ups and downs, and the characters were full of artistic and historical value.