Using the framework of centripetal and centrifugal force, this article analyzes alternating periods of peace and conflict in South Korea-Japan mutual perceptions since 1998 when the two nations took unprecedented conciliatory actions. Centripetal force is comprised of political leaders’ reconciliation initiatives, restrained historical/territorial disputes, and common security threats. centrifugal force incorporates heated historical/territorial disputes, political leaders’ use of those disputes for their political purposes, and divergent security priorities. This article suggests that top political leaders in both nations can play a significant role in improving or aggravating mutual perceptions between the two neighbors. However, political leaders’ conciliatory initiatives are a necessary but insufficient condition in reconciling the two former adversary states.