After the juvenile sexual offender entered the juvenile Remedial Institution, they often minimized their offenses due to the prison subculture. It is difficult to approach the historical truth to understand what is really happened in his crime. In this case report, we found he tried to build his heroic image to falsely add a crime of injury death to cover up juvenile sexual offences. He still insisted his argument even his lie seem to be exposed at any time. When all truth have been clarified, he became quiet irritable and agitated due to the confrontation. Then he interpreted as the voice commanding of amphetamine psychosis for his lie. This paper attempt to interpret the meaning of this phenomenology. Besides, the narrative truth is acceptable during the process of narrative therapy.