In the Battle of Chongxiao, Bai Yutang, the fourth-rank Kaifeng Mansion guard with a sword, was killed while exploring Chongxiao. His body was so damaged that it was difficult to identify him. After his four brothers and close friend Zhan Zhao buried his ashes, they received a phoenix-patterned hairpin from a woman named Lin Wenyun who asked the young master of the Tiancheng Escort Bureau to give it to Zhan Zhao.
At the same time, the Tiancheng Escort Bureau's headquarters in Yanzhou was wiped out. Only a few people in the Escort Bureau survived: its young master Zong Fu Yang was escorting the phoenix hairpin to Kaifeng Mansion. At the same time, there were also a few people who were not in the Escort Bureau who escaped: Zong Fuyang's father Zong Changheng's sworn brother Taigong Xuanju, his uncle Xiao Zhenyi, and his junior brother Xu Beiqiu who was seriously injured and has been unconscious.
Zong Fuyang was so sad that he asked the Kaifeng Mansion for help in investigating this case of family extermination. Bao Zheng agreed and sent Zhan Zhao, a third-grade sword-wielding guard, to Yanzhou to investigate the case with Zong Fu Yang. When passing through Daming Mansion, he met Taigong Xuanju who was about to rush back to Yanzhou after hearing the news. At the same time, while waiting for Taigong Xuanju, he met two young men in the inn, Han Qi and Tang Dai Xun Bu Da. The five of them walked together. However, he was repeatedly ambushed on the way to Yanzhou. Zhan Zhao concluded that apart from him and Zong Fuyang, at least one of the other three among them would be a spy sent by the enemy...
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