The TV series of World War II theme After War is adapted from the prototype of "Gu Shoufu" and reveals the history and unsung heroes before the 1946 Nanjing trial. Produced by Ciwen Pictures, it is a sister piece to Special Agent Group 5 which uses the original cast of Special Agent Group 5. For this, Yu Zhen will once again play "Ma Yunfei". Although they are both named Ma Yunfei, the two characters' personalities are very different. The director and screenwriter had to work hard to distinguish between the two. The Ma Yunfei in Special Agent Group 5 is debonair and has a more free-spirited personality and is more casual when dealing with matters. This Ma Yunfei is more mature; as long as he believes in something, he is very persistent and sticks to it.