After the arduous eight-year war of resistance against Japan, the ancient land of China has not escaped the burning of war, and the people immediately ushered in the KMT-CPC civil war that determined the future of the nation. In order to take the initiative in the war, both the KMT and the CPC are making intensive preparations, and various intelligence wars are quietly carried out under the cover of gunpowder. In the southwest border, the Kuomintang spy organization "Gray Society" is developing a weapon of mass destruction, and Liu Mingyi, a gas expert and Communist Party member code-named "Kitten", was also captured by spies and thrown into the notorious secret prison Baishan Pavilion. In order to prevent the harm of lethal weapons to our party and our army, our party's top leaders finally sent a senior agent lurking in the Kuomintang-Zhang Haifeng (played by Yu Hewei), deputy director of the Chongqing Military Supplies Department, to carry out the rescue. Shouldering the heavy responsibility, Zhang took the initiative to expose his identity and was thrown into Baishan Pavilion by the enemy. In the days to come, he will face unimaginable torture and tests for Chang Ren...