Gu Yuan, the youngest chief medical examiner at the Haicheng City Forensic Identification Center, is famous for his lancet. He is calm and precise, and is more patient with corpses than living people. Until an unknown skeleton that had been dormant for twenty years was brought to the autopsy table. While cleaning the bones of the deceased's knuckles, he discovered a faded plastic soldier buried deep inside - a toy he had lost in childhood and could never find. What made him even more horrified was that the time of death of the corpse exactly matched the day he remembered the toy being lost. An unexpected discovery pulled him into a shocking conspiracy that spanned twenty years. Lost memory fragments began to emerge. What happened on that forgotten summer afternoon? What he wants to dissect is not only this unknown corpse, but also his own dust-laden past.