BTS, a seven-member K-pop boy band from South Korea, is regarded as cultural, social, and economic "Next Generation Leaders" due to their commitment to themes such as mental health, education, and the environment. A significant part of their success is attributed to their dedicated fan community, the BTS A.R.M.Y. This transnational community, active both online and offline, is characterized by their loyalty to the band as well as charitable and activist engagement. The present study, based on sociological theories of postmodern communitas, examines how members of the German BTS A.R.M.Y. create transnational community. The research relies on empirical data from 13 group interviews conducted between February 14 and May 18, 2023, and analyzed using Strauss' and Corbin's Grounded Theory methodology. The study sheds light on contextual factors, fandom triggers, community-building strategies, and their consequences. Contexts encompass the genre features of Korean popular music, the significance of social media platforms, identification with band members, and the development of parasocial relationships. Fandom triggers often stem from introversion and psychosocial issues faced by the participants. Community-building strategies consist of the collective engagement in fan activities, the establishment of shared values, norms, and core topics, as well as the use of a symbolic sign system. As a result of these actions, many respondents experience, on one hand, stigma from outsiders regarding their passion. On the other hand, they report changes in their way of life, particularly in the form of personal growth, increased self-love, and openness to new experiences.