This study explores the impact of micro-level individual dimensions in the Internationalisation of Higher Education (IHE) on educational developers in a Collaborative Online International Learning (COIL) teacher training course. Focusing on 10 educational developers (EDs), the study utilizes narrative interviews to delve into their personal and professional growth. Through storytelling, transformative processes emerge, revealing shifts in perspectives, pedagogical approaches, cultural humility, and professional practices. The study highlights facets such as cultural humility, global citizenship, and a sense of belonging. Inductive thematic interpretation underscores the COIL course's role as a crucible for understanding internationalisation dynamics. The research contributes valuable insights into educational developers' growth, positioning them as pivotal in the global transformation of higher education.