The play is adapted from Qin Ming's literary work "Silent Testimony", which tells the story of Qin Ming, a fledgling talented young man, with the help of Lin Dang and others, step by step out of the haze of childhood memories and grow into a forensic god who can control the overall situation.　　Fifteen years later, a case with the same characteristics as the murder case experienced by Qin Ming 15 years ago actually happened again in Longfan City. Is it a copycat? Or did you catch the wrong person back then? Or is there another accomplice to the murderer? The nightmare of the old case was turned out again, and the knot in his heart was constantly troubled, and Lin Dang, who was chaotic at the scene, often caught Qin Ming off guard...... The iron cage corpse case, the "Rogue League" case, and the "Death Knight" case occurred in a row. In the end, his biological father was actually involved in the whirlpool of the case...... The memories of that year came to mind little by little, and the murderer surfaced at any time......