The story takes place in Chongqing, the temporary capital in 1945. Xu Zhongyi (played by Sha Yi), a student of the Kuomintang special training class, was ordered to join the Military Control Commission in Shenyang because of his repetition. His task was to infiltrate the Communist Party of China as an undercover agent. Chen Ming (played by Zhao Chunyang), the head of the secret service of the Military Control Commission Shenyang Station, was unaware of the situation and had doubts about Xu's sudden return to the Northeast. Xu Zhongyi cleverly resolved Chen's suspicion by setting up a bureau. Since Xu Zhongyi was forced to join the Military Control Commission that year, he was gradually educated by the Communist Party's benevolent spirit and eventually surrendered to our party. After a strict examination of him, the party decided to let him play a role for our party within the enemy. Xu Zhongyi, who surrendered, took advantage of the enemy's war-weariness after a series of defeats, split and disintegrated it internally, and provided a large amount of urgently needed military supplies for our army. It turned out that his old rival in the Military Control Commission, Mr. Qi (played by Cao Bingkun), came to Shenyang and brought the "infiltration" action plan drawn up by his superiors. Xu Zhongyi knew that the storm was coming...