The protagonist, Lin Han, is a top forensic doctor in the provincial department and never gets involved in political intrigues. A major and difficult case that caused a sensation across the country forced him to take over the task at the critical moment and transfer him to a special inspection post, and then went to the grassroots to perform his duties. With rigorous forensic evidence, human insight gained on the autopsy table, and accurate psychological profiling capabilities, he upholds justice in complex situations. He uses evidence as a blade and truth as a spear to break the mystery time and time again, uncovering the black sheep hiding in the dark, and safeguarding fairness and justice.