Thought reform campaigns aimed at the psychological transformation of captives have long been tools to enhance national security and political legitimacy in East Asia. Fusing Soviet concepts of human perfectibility and Confucian ideals of transformation through education, sophisticated systems have evolved to convert political opponents. Whether labelled as tenkō in Japan, ‘self-renovation’ in Nationalist China, or ‘new learning’ in the People’s Republic of China, these programmes shared the fundamental goal of pressuring individuals to renounce previous beliefs and adopt state-sanctioned ideologies. This article examines how Japanese war crimes prisoners, political dissidents, and former Chinese Nationalist officers experienced these campaigns. Despite differences in implementation, each regime used confession, group study, and psychological coercion. This historical perspective is particularly relevant today as China’s leadership continues to weaponise historical narratives – including the ‘correct’ understandings of WWII history – with implications for contemporary tensions between China and Taiwan.