This clinical intervention study evaluates a newly developed Brief SEE FAR CBT protocol for adults aged 18 years and older with posttraumatic stress disorder (PTSD), compared with dynamic psychotherapy treatment as usual. Participants in the Brief SEE FAR CBT group will receive 6 focused sessions emphasizing intrusive PTSD symptoms and will then continue to complete the full 12-session SEE FAR CBT protocol. Participants in the control group will receive dynamic psychotherapy as treatment as usual. Psychological outcomes will be assessed using self-report questionnaires at four time points: baseline, after 6 sessions, after 12 sessions, and at a 3-month follow-up. The study aims to examine changes in PTSD symptoms, anxiety, depression, perceived stress, resilience, somatic symptoms, sleep quality, and related psychological outcomes over the course of treatment and follow-up.