The soul of a modern forensic doctor traveled through Song Mang, a descendant of Song Ci, and went to the Song Dynasty with his forensic skills and the wisdom of traditional Chinese medicine. He relied on autopsies and broken bones to identify spider threads, used benevolence and iron fist to solve strange cases, repeatedly solved headless doubts and secret room puzzles, and kept justice to protect the people in the undercurrent of the court and people, writing the legend of solving cases in the Song Dynasty.