South Koreans today witness a “war of the sexes” on a daily basis in the key spaces occupied by young Koreans. This paper studies the emergence of the term hannam, which pejoratively refers to Korean men and whose currency has proven to have a full capacity to trigger a discursive war of the sexes. Mindful of the emergence of the coinage and associations, the paper analyzes a diverse range of accounts from literature, media reports on criminal cases, and other journalistic accounts on “scandals,” among others. On that basis, we argue that hannam’s emergence is neither recent nor sudden and that indeed it has taken form within fluctuating masculinities since the 1990s. The paper places the hannam discourse historically in the larger context of the dissolution of what we call the “system of authenticity,” a discursive and representational system specific to the 1980s wherein the icon of “patriotic young male martyr” prevailed in connection with the cause of the fatherland and minjok (ethno-nation) on the one hand, and on the other, in terms of not only South Korean economic growth over the last two decades but also the conspicuous growth of feminism and the democratization movement; hannam marks the eventual moment in which Korean women, usual targets of hate speech and violence, finally talk and act back.