Transnational networks and solidarities among activists in Asia have recently attracted increased scholarly attention. Research on the ‘Japan-Korea Solidarity’ (Nikkanrentai) movement among progressive Japanese intellectuals, Korean Christians, and Korean residents in Japan during the 1970s and 80s has shown how the South Korean democratization movement helped to construct a common foundation for discourses and ideas about democracy, human rights, de-imperialism, and post-colonialism in the region (Lee 2018). However, scant attention has been paid to the ways transnational networks among activists spread more broadly throughout the region, including into Southeast Asia. This paper will examine these ‘forgotten connections’ among South Korea, Japan, and Southeast Asia by focusing on the artist Tomiyama Taeko (富山妙子), who had earlier produced visual images and slide films based on the poems of Kim Chi-ha (金芝河), the May 18 Gwangju Uprising, and the war crimes of imperial Japan. Through interviews with former activists and intellectuals including Thais and Filipinos as well as Tomiyama Taeko, and analysis of key primary sources, this paper sheds light on the transnational circulation of information, visual images, and ideas among dissidents in Asia. It will discuss how such dissidents developed transnational networks and solidarities in order to both resist the ongoing paradoxes of colonialism and imperialism and empower their movements through the amplification of resonant voices.