This qualitative case study explores how two English language teachers from South Korea and Taiwan developed transcultural dispositions as they participated in a virtual professional development program. The study employed third space as a conceptual framework and the third generation of cultural-historical activity theory (CHAT-3rd) as an analytical framework to uncover the teachers' learning experiences. Findings from this study reveal the dynamic and complex process of becoming a trans-educator through transforming one's professional identity and teaching practices. This study contributes to inclusive and responsive educational practices that reflect the complexities of globalized teaching and learning environments.