The grand military spy drama "Undercover General" was adapted from the novel "Secret Messenger" by Zhang Chenggong. Against the backdrop of real historical events, it shows the progress of the Liberation War through the changing fortunes of undercover intelligence personnel. It portrays the intellectual battles and strategies between high-ranking officers and intelligence personnel of the Kuomintang and the Communist Party in grand war scenes and thrilling spy games. It weaves together the vicissitudes of fate under a precarious world and the romance under a background of warfare. With counterintelligence and double agents, the story is shrouded in doubt and suspense, making it irresistible. At the same time, "Undercover General" also inherits the style of human nature reflection that runs through Zhang Chenggong's works. By exploring the contradictions of human nature in the context of war, it presents the faith choices, intertwining love and hate, conspiracies and betrayals among several pairs of characters, filled with a strong sense of history and destiny.