The timeline of the story is set in 1941. Li Ya, a military reunification agent, used the pseudonym "Li Mo" and, as a history student at Peking University, sneaked into Yan'an through the "Youth Exchange Program" in the context of cooperation between the Kuomintang and the Communist Party. His mission is to lurk for a long time, collect high-level intelligence of the Communist Party of China, infiltrate the Anti-Japanese Army, and wait for opportunities to sabotage.
The content is rich and the plot is real.