KoreaAID, the new international development initiative of the South Korean government, was launched in Ethiopia in 2016 during the Park, Geun-Hye administration. Despite their critical stances towards promoting the Korean developmental state model in Ethiopia, Korean aid workers voluntarily sacrificed individual life and morality by mobilizing a vast number of their partners and rural residents who had collaborated in the New Village Movements and family planning projects they had implemented in Ethiopia. I examine calculative rationalities and mobilizations via mobile medical units as the legacies of the Korean Developmental State among Korean aid workers in their voluntary mobilization for KoreaAID project.