Language teachers are professionally expected to serve as educational innovators, change agents, and particularly teacher-researchers. Teacher-researcher identity and its negotiation have received much attention from international scholars. In Vietnam, substantial research has been conducted to examine this concept and its influential factors among tertiary lecturers. Nevertheless, a research gap remains in understanding factors affecting teacher-researcher identity negotiation from other teacher demographics, particularly from an insider’s perspective. Therefore, this autobiographical introspective narrative inquiry addressed this gap by shedding light on the contextual influences on my teacher-researcher identity negotiated during the process of completing a Master’s graduation thesis. Guided by Bronfenbrenner’s Ecological Systems Theory of Human Development as the theoretical framework, the study gathered data from my autobiographical writings and semi-structured interviews with two purposefully-selected outsiders. The collected data were deductively analyzed through thematic analysis. Results revealed that contextual influences (personal, academic, institutional, and socio-cultural contributors) on my teacher-researcher identity negotiation were nested into an ecological system of four concentrated layers, including the micro-, meso-, exo-, and macro-systems, respectively. These findings further showed how the socio-academic condition of the Mekong Delta region affectionately nurtured my growing maturity as a qualitative teacher-researcher. Beyond its scholarly contribution, this study is also a testament to how one’s roots can illuminate the path toward becoming a teacher-researcher, offering inspiration for others walking a similar journey.