On the eve of the Liaoshen campaign, the Northeast Field Army attacked the counties around Jinzhou and surrounded Jinzhou. The intelligence agent code-named "Green Snake" was arrested, and Lin Xi, the head of the Confidentiality Bureau with heavy responsibilities, was ordered to go to Jinzhou to conduct a thorough investigation of the incident together with Zhou Yingqun of the Party Communication Bureau and Jiang Wei of the Second Department of National Defense. Lin Xi was actually a red agent whose secret mission was to rescue the "Green Snake" and help him hand over the Jinzhou city defense map to the east outside the city to support the attack on Jinzhou. Unexpectedly, in the city of Jinzhou, there were surging undercurrents and numerous changes. Faced with the heavy enemy fortifications, could Lin Xi successfully complete the task? The meeting with Xia Qing and her group was like suddenly crossing into an unrelated line on a one-way street in life, as if Lin Xi had found a new direction to move forward. Where was his destination this time? At the darkest moment, waiting for him must be a bloody battle.