The film mainly tells the story of the "Five Heroes of Shaoshan" and other revolutionary patriots who carried out secret missions and fought wits and courage with the enemy under severe life and death tests during the Great Revolution. The excitement of the spy war and the ideals and beliefs against the backdrop of the times will be presented one by one. The protagonists Mao Jiaxuan (played by Chen Minghao) and Shen Zhuoyi (played by Guo Xiaodong) fought a desperate secret battle to carry out a secret mission. Both of them recognized their codenames as "Pang Defu". Who is the real "Pang Defu" and what does this codename mean? The identities of the characters are reversed in many ways, and the truth is confusing.