This article explores three Korean teachers' experiences of carrying out practitioner inquiry as a means of providing meaningful teaching under the test-centred schooling regime in Korea. Practitioner inquiry is a concept that includes multiple genres of educational research such as action research, teacher research, and self-study that aim to change practitioners' individual practice and, ultimately, the schooling in a society. Based on the analysis of qualitative data, the researcher found that teachers developed their knowledge and expertise in their specific areas of interest and developed strong motivations for transforming the education system. However, their inquiry was limited in practice due to the imposition of test preparation and a prescribed national curriculum. As a result, greater collaboration among practitioners, which not just involves teachers, but wider entities such as administrators, policy makers, and researchers, is required to challenge the current unjust system.