In the early years of the Republic of China, the situation in Jiangzhou, Southwest China, was in chaos, and strange cases occurred frequently. Qin Huole (Xia Zhiguang), who had just returned from studying abroad, met detective captain Song He (Wu Xize) in troubled times and worked together to explore the mystery. With the help of female forensic doctor Fan Xiaofan (Wang Yizhi), the three of them, with their sincerity and wisdom, dispelled the bloody fog that shrouded the people and protected justice in the world.