The TV play "Battle After War" based on the World War II is adapted from the prototype of "Gu Shoufu", revealing the unsung heroes behind the history before the 1946 Nanjing trial. It is the sister piece of Ciwen Film and Television's "Special Agent Group No.5", using the original cast of "Special Agent Group No.5". For this reason, Yu Zhen will once again play the role of "Ma Yunfei". Although both are named Ma Yunfei, the two characters' personalities are very different. The director and screenwriter spent a lot of effort to distinguish between the two. The Ma Yunfei in "No.5" is suave and has a more unrestrained personality, dealing with things more casually, while this Ma Yunfei is more mature. As long as he believes in something, he is very persistent and determined.