Due to the relentless infighting among warlords, Sun Yat-sen sent his representative Song Huairen to Kangcheng to convene a crucial meeting. However, upon arriving, Song was immediately targeted in an assassination attempt—only to be rescued by Fang Jiaming. Police officer Qiao Qingqing investigated the mastermind behind the attack, determined to expose the truth. But when her pursuit drew suspicion, she was captured and held hostage. Meanwhile, the villainous Zhuo Buqun planted poison gas at the meeting venue, threatening all attendees.

In order to break the great difficulties caused by the Japanese invasion of the Japanese army and the economic blockade of the Kuomintang, the Shaanxi-Gansu-Ningxia Border Region government led by the Communist Party of China called on the military and civilians in the border areas to "work while fighting"