During the Tianqi years of the Dayin Dynasty, the imperial power fell to the side, the eunuchs colluded with the vassal kings, and there was an undercurrent in the court. The Tiangong Department was originally the Qingshui Yamen in charge of all kinds of craftsmanship, but it hid a secret guard directly under the emperor - the Qingque Guard, who was responsible for detecting strange cases that the court could not bring to the table. The protagonist, Shen Yan, was originally a young prisoner of the Qintian Prison. Due to his involvement in an unjust case and the death of his family, he was rescued by Jiang Zhifei, the commander of the Tiangong Bureau, and was admitted to the Qingque Guard. With his extraordinary craftsmanship and talent in trace science, he unraveled the cocoons in a series of murder cases and uncovered a shocking conspiracy that shook the foundation of the dynasty.
