Yu Xinjiang is a character in Hongyan and a member of the underground party of Chongqing University. His job is to provide materials and information to the guerrillas in Chongqing for a long time.

In the novel, he was betrayed by the traitor Pu, arrested and held in Zhazidong prison. Although tortured in prison, he never revealed any information about guerrillas and underground parties. He also actively participated in various resistance activities in prison, such as organizing study groups and transmitting information.

In the novel, Yu Xinjiang is a staunch communist and a brave resistance fighter, and his image fully shows the faith, courage and spirit of sacrifice of the people of China.