With a vision to empower justice-involved youth to become pro-social, thriving members of society, clinical psychologists at the Hong Kong Correctional Services Department have established the Youth Lab, a youth-friendly treatment facility within correctional institutions, and the community-based Change Lab which showcases manga drawings depicting the desistance journey.  These specially designed warm and secure therapeutic environments facilitate rehabilitation, reintegration and desistance through pioneering psychologically-informed, youth-responsive intervention that structured around the three-stage desistance framework. The first stage focuses on crime abstinence through the P.R.E.P. programme that cultivates pro-social values, resilience, emotion regulation and problem-solving skills, incorporating virtual reality role-play, a digitalised psychological programme and therapeutic games to enhance treatment engagement. The second stage fosters non-offending identities by integrating character strength intervention into therapeutic sports, using narrative therapy for re-authoring desistance narrative, as well as utilising character strength parenting to guide parents to recognise their children’s strengths. The final stage emphasises social reintegration and acceptance, with Desistance Celebration Day uniting family members, community partners and other outsider witness to validate their progress. Recognising correctional staff as key rehabilitation facilitators, initiatives have been introduced to promote a rehabilitative culture. Retreat workshops support staff to manage work stress, strive for self-improvement and share insights into ideal young offender institutions. Staff training on procedural justice and five-minute intervention fosters respect, trust and constructive engagement with youth. Encouraging findings, including lower reoffending rates, enhanced rehabilitative orientation and improved staff satisfaction, highlight the promise of this holistic approach in creating a safe, rehabilitative custodial environment.