This report presents a qualitative phenomenological study on the lived experiences of mentally disordered offenders with dual diagnosis. The research, employing the interpretative phenomenological analysis (IPA) method, explores the complexities of this psychological condition, which involves co-occurring mental illness and substance use disorder. The study, conducted with a sample of five participants, delves into their perceptions of self, substance abuse, and recovery strategies. Key findings reveal participants' struggles with self-fragmentation, the integration of social aspects of addiction, and the importance of self-discovery in rehabilitation. The report highlights the significance of understanding the interplay between mental health, substance abuse, and criminal behavior to improve clinical interventions and support the recovery of individuals with dual diagnosis.