This study explores the consumption of political information, differing perceptions among conservatives and liberals of susceptibility to effects of pro-and counter-attitudinal media and their influence on political attitudes with a focus on the presumed media influence framework. The study draws on an online survey of presumed media influence and political attitudes, carried out in January 2019 when confrontations between conservatives and liberals were increasing in Korea. The results highlighted politically divided information consumption and perceptions of pro-and counter-attitudinal media effects among conservatives and liberals. As a consequence of presumed media influence in the context of pro-and counter-attitudinal media, liberals who perceive that in-group members are susceptible to conservative media showed a higher level of political inefficacy, while the presumed influence of conservative media on out-group members among liberals produced less political inefficacy.