This study is aimed to explore various conflict phenomena in the field of early childhood education and care, through the theory of a complex system, focusing on teachers’ perspectives. Through qualitative meta-synthesis, qualitative studies of conflict cases in kindergartens and daycare centers were analyzed and interpreted. As a result, the complexity of conflict experienced by teachers was encountered with ‘interaction, non-linearity, feedback loop, and self-organization.’ Early childhood teachers experienced personal or social conflict in various and dynamic entanglements with many agents, including children, parents, a principal, colleagues, special teachers, assistant teachers, and after-school teachers. However, because such conflict interactions are nonlinear, teachers should respond sensitively to minor fluctuations, as well as focus on how the conflict works. In particular, the experiences of repetitive conflict for early childhood teachers could lead to unexpected directions through feedback loops, reappear at any time in a latent state, and come back to themselves through various routes. Furthermore, early childhood teachers and institutional organizations themselves, rather than central control or external intervention, must change in the environment and promote innovation. This study provides theoretical and practical implications for the complexity and dynamics of conflicts in the context of early childhood education and care.