Shen Chengxuan was ordered to sneak into the Japanese and puppet intelligence systems, but was targeted by Du Ziqing in a confrontation between "real and fake codes". The two were suspicious of each other on the surface and complicit secretly. They followed the same message chain all the way into the situation: radio stations, secret codes, substitutions, disguises, and counterattacks. Every step was like walking closely under an iron mesh. In the end, when both the military commander and the underground party reached out to him, Shen Chengxuan had to make a trade-off between leaking secrets and saving people.
