Who is the traitor in the independent group of Iron Blood Red Security?

According to the plot of "Iron Blood Hong 'an" 15 episode, Deputy Political Commissar Zhai was deeply introspected after being abandoned by Anwazi Liu Tongluo. Not only did he not punish Liu Tongluo, but he also surprised everyone through self-examination. In the preview of the episode of "Iron Blood Hong 'an" 16, the independent regiment of Laojunshan rest team was besieged by the national army again, and Zhai, the deputy political commissar, was also injured by the plane. Am I okay?