Shi Yan has a special ability - he can draw the murderer's childhood appearance in his mind through traces at the crime scene. This is not a superpower, but a synaesthetic association based on criminal psychology. Detective Jian Ning thought he was a genius until he drew a psychological portrait of the murderer of an unsolved case ten years ago - the ten-year-old boy in the portrait was Jian Ning's biological brother who had been missing for many years.
