This research examines the Karen diaspora's transnational sense of belonging, ideological transition and tactics embodied in transnational activities after the 2021 Myanmar military coup. Looking at young Karen people in 5 host countries including the United States, Australia, Canada, Norway and Thailand, it is evident that those people in the diaspora still perceive the notion of homeland and maintain an emotional sense of belonging to their homeland after a long period of resettlement in host countries. In the context of the 2021 coup, those young people have engaged actively in transnational activities with various tactics used both on-site and online. Quantitative methods were applied including semi-structured interviews and online participant observations to understand how those young refugees feel connected to their homeland, as well as how and why those young refugees� have engaged in transnational practices. After examining the narratives and ethnographic work, I argue that the transnational sense of belonging of young Karen people were shaped by narratives, memories, and Karen cultural practices in refugee camps; and those camps also become their memorial places. In addition, after the Myanmar military coup, those young Karen people expressed an ideological transition from ethno-nationalism to democracy and cosmopolitan orientation when engaging in transnational activities.