COVID-19 is an unprecedented pandemic that has impacted the whole world. The pandemic made researchers and educators realize the critical need to prepare for future disasters. This study explored a context-specific case for elementary online learning where we investigated how elementary school teachers transitioned to emergency remote teaching (ERT) from face-to-face to online learning during the pandemic. A case study approach was used to explore South Korean elementary teachers' ERT approaches and experiences during COVID-19. Using the CIPP (Context, Input, Process, and Product) framework, we sought to understand how the transition occurred from the perspectives of the teachers. The analysis uncovered several themes that fall under each category of the framework. In terms of context, limited technological aptitude and lack of training in online instructional design as well as policy issues and socio-economic differences were identified as key factors in assessing the current state of the ERT. In terms of input, instructors' efforts as well as support from in and out of school were discussed. Student interaction and engagement were identified as key factors in understanding the process of ERT. Lastly, learning outcomes, instructional strategies, and systemic transformation emerged as products of ERT.