ABSTRACT This paper examines the representative and performative aspects of the legal title ‘marriage migrant’, which surrounds the everyday lives of Vietnamese women who married South Korean men. While previous studies have predominantly addressed how categorisation by receiving states reproduces certain identities and treatments for those on the move, little is known about how it influences migrants’ behaviour. Drawn on observations and in-depth interviews with Vietnamese women married to South Korean men, this paper demonstrates that the category ‘marriage migrant’ not only carries gendered and socioeconomic hierarchised identities but further shapes Vietnamese women’s actions in response to those responsibilities and classifications. The research findings emphasise how categorisation and discourse reconfigure ethnic networks at the intersection of gender, class, and mobility. This study offers a nuanced understanding of intra-group dynamics within migrant communities, highlighting the implications of migrant agencies in categorising politics.