Purpose: This study explored the comprehensive experiences of nurses who volunteered for medical services at Saemangeum Jamboree using a systematic qualitative Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis framework. Methods: Semi-structured in-depth interviews were conducted with 12 nurses between March and October 2024. The collected data were analyzed using a conventional content analysis methodology with ATLAS.ti 6.2 software. Subsequently, the derived subcategories were systematically organized and classified within a SWOT matrix framework to provide structured insights into the experiences of the volunteer nursing. Results: The comprehensive analysis yielded 125 meaningful codes, which were systematically categorized into 23 distinct sub-themes and ultimately structured into 14 overarching themes within the SWOT matrix framework. The identified strengths included nursing expertise and clinical competency, building therapeutic trust through patient-centered care, and creative problem-solving in crisis situations. The identified weaknesses included experiencing physical and emotional exhaustion, language barriers due to limited foreign language proficiency, and initial resource constraints that compromised the quality of care. The opportunities identified included patient thankfulness reinforcing commitment to duty and guardians, valuable experience in cross-disciplinary collaboration highlighting the importance of teamwork, and increased sponsorship resources throughout the event progression. The identified threats encompassed a lack of response from administrative organization, absence of standardized nursing protocols or manuals, occurrence of the coronavirus disease 2019, ambiguity in roles and responsibility, and insufficient measures to ensure physical safety in the service area. Conclusion: The comprehensive findings of this study suggest that maximizing the effectiveness of nurse volunteers and enhancing volunteer satisfaction in future large-scale international events requires strengthened pre-event training programs, establishment of a systematic resource management system, and development of comprehensive response protocols for various emergency situations. This study provides essential foundational data and practical insights for planning and operating medical volunteer programs at similar international events and contributes valuable knowledge to the field of disaster nursing and humanitarian healthcare delivery.