Between 2016 and 2019, South Korean conservatives organized a movement called the T'aegŭkki Rallies to oppose the impeachment of President Park Geun-hye and to protest against President Moon Jae-in's administration. This movement is puzzling for its timing, demographic composition, and rhetorical choices. Through in-depth interviews with rally participants and non-participants, I illustrate that a collective identity, shaped by authoritarian socialization, strengthened with positive memories about an authoritarian past, combined to mobilize rally participants. Curiously, rally participants saw themselves as defenders of liberal democracy, protecting South Korea against progressive forces seeking to turn the country into a communist state. However, my interviews revealed that they were, in fact, trying to protect the authoritarian past. In this manner, South Korea's authoritarian legacy entrenches ideological polarization and hampers common understandings of democratic citizenship. [ABSTRACT FROM AUTHOR]