The goal of this clinical trial (single-arm pilot trial) is to learn whether a mobile application-based mindfulness intervention can improve mental health outcomes in older Korean immigrants aged 60 years and older. The main questions it aims to answer are whether the 8-week mobile app-based mindfulness intervention is feasible and acceptable, as indicated by recruitment, retention, and adherence rates, and whether participation in the intervention leads to improvements in positive psychological well-being (e.g., positive affect, optimism, life engagement, and mindfulness) and reductions in adverse mental health outcomes (e.g., anxiety, depressive symptoms, and perceived stress). Participants will complete baseline and post-intervention assessments, receive training on how to use the mobile mindfulness application, engage with the app for approximately 8 weeks (recommended 10-15 minutes per day), and participate in weekly check-ins to support engagement and address any challenges encountered during the intervention.