The purpose of this study is to examine whether the work-life balance of smart work users affects their quality of life. More specifically, this study aims to investigate how role ambiguity and family life conflict caused by the use of smart devices for work purposes undermine work-family life balance and, furthermore, how they affect quality of life. An additional purpose is to examine how technostress-related outcomes from smart device use, namely burnout and helplessness, moderate the relationship between work-family life balance and quality of life. Data were collected from a total of 235 smart device users, and the research model was validated using PLS (partial least squares) and Baron and Kenny's (1986) mediated regression analysis technique. All four proposed hypotheses were found to be statistically significant. In particular, work-family life balance was found to fully mediate the relationship between role ambiguity and quality of life, while a partial mediating effect was confirmed in the relationship between family life conflict and quality of life. Additionally, burnout and helplessness were found to negatively moderate the relationship between work-family life balance and quality of life. This study holds academic significance in that it extended the discussion to the relationship between work and family life, presenting measures for effectively managing technostress within organizations while advancing research on improving quality of family life. Furthermore, the fact that this study systematically identified not only the positive functions but also the dysfunctions arising from smart device use from the perspectives of both work and daily life domains, thereby establishing an academic foundation for continuing the discourse on the information technology paradox, represents another academic contribution of this study. From a practical standpoint, this study is expected to assist companies adopting smart work programs in establishing plans where both the organization and individuals can mutually thrive by creating a virtuous cycle of work and life, by presenting the adverse effects of work-life imbalance that arise from the rapid transition to smart work environments.