"Dad, let me introduce you. This is Jiang Yuan, the forensic doctor who led the investigation into Xiaoming's case. His main profession is forensic analysis, but he also specializes in fingerprints, bloodstains, and footprints. He can determine the identity, age, height, and weight of a person just by examining their footprints. His bloodstain analysis was... it was the crucial technique that found the murderer who killed my brother."
Zhang Xiaoya's introduction to her father, Zhang Zaiyang, was slightly exaggerated, primarily because she herself didn't know much about Jiang Yuan's expertise. However, the way she introduced him was the most comprehensible for laypeople.
But Zhang Zaiyang didn't actually listen closely to Zhang Xiaoya's introduction—he had already learned everything he needed to know long ago.
Father Zhang Zaiyang stood up and shook Jiang Yuan's hand firmly, covering it with his left hand and gently patting it. He said softly yet weightily, "Thank you. Thank you."
