Xiao Zheng Guo goes on a mission with two other BIS agents, but they are ambushed by the Japanese. Xiao Zheng Guo is injured, but is actually shot by one of his own. The Japanese try to save him, but he dies. Chen Shan looks very similar to Xiao Zheng Guo, but is really just trying to make ends meet. He attacks a Japanese and gets caught. (Source: jindreame at MyDramaList)