Suengkamolpisut W.Singhatong S.Viriyamano S.Mahidol University2026-02-232026-02-232026-01-15Journal of International Students Vol.16 No.1 (2026) , 1-2221623104https://repository.li.mahidol.ac.th/handle/123456789/115270This study examines how Thai undergraduate students developed intercultural competence, leadership identity, and sustainability perspectives through a two-week blended international program. Using a qualitative design, data were collected from interviews with 24 students (16 nonparticipants and 8 participants) and from reflective journals. Thematic analysis revealed three developmental shifts: sustainability perspectives advanced from corporate social responsibility (CSR) and sustainable development goals (SDGs) framing to applied systems thinking; leadership identity evolved from aspirational to collaborative practice; and intercultural engagement deepened through adaptability, empathy, and confidence. The findings highlight the transformative potential of short-term blended programs in Southeast Asia and their alignment with SDGs 4, 12, and 13.Social SciencesArticleSCOPUS10.32674/sa3esk642-s2.0-10503017076121663750