The TV series "Post-War" adapted from the story of "Gu Shoufu", reveals the history and unsung heroes before the 1946 Nanjing trial. Produced by Ciwen Film and Television, it is a sister piece to "Special Agent Group No.5", which also reunites the original cast from "Special Agent Group No.5". As a result, Yu Zhen will once again play the role of "Ma Yunfei". Although both characters are named Ma Yunfei, their personalities are very different. The director and screenwriter had to work hard to differentiate between the two. In "Special Agent Group No.5", Ma Yunfei is suave and has a rather unrestrained personality, dealing with things in a more casual manner. However, this Ma Yunfei character is more mature. Once he sets his mind on something, he is very persistent and determined.