On the eve of the Liaoshen Campaign, Zheng Chaoyang, an underground party member hidden in the Beiping Police Station, had to retreat urgently due to betrayal by a traitor. At the same time, he took away the underground lurking list carefully prepared by the Kuomintang. Zheng Chaoyang came to Xibaipo to participate in the study class for taking over the city, and the list he brought back after going through hardships dealt a devastating blow to the Kuomintang spies lurking in the Beiping area. The Kuomintang had to launch a special action group composed entirely of "Cold Chess" agents, code-named Taoyuan. The person in charge of "Taoyuan" is Zheng Chaoyang's brother, the director-general of the Beiping Youth Promotion Association, and the famous doctor Zheng Chaoshan. Beiping was peacefully liberated, and Zheng Chaoyang returned to Beijing. He faced not only the remaining latent spies and tens of thousands of Kuomintang stragglers, but also the mysterious "Taoyuan" action group and his brother Zheng Chaoshan, code-named Phoenix. The two brothers each represented their own class and began a tit-for-tat confrontation. The two were good brothers in public, but they used all their tricks in secret, and the confrontation continued to escalate. In the end, the Taoyuan Action Group was completely destroyed. The city of Beijing has undergone earth-shaking changes. Everyone seemed to be reborn from the ashes, with hope in their eyes.