The COVID-19 pandemic has rapidly transformed the job market, increasing the demand for career counselors. As these professionals face evolving challenges, it has become crucial to regulate their anxiety and promote job well-being. Research highlights the importance of emotion regulation in reducing anxiety (Prikhidko & Swank, 2018) and shows that both personal and environmental factors strongly influence job well-being (Demerouti et al., 2001; Xanthopoulou et al., 2007). However, most existing studies have relied on cross-sectional designs, limiting their ability to capture dynamic psychological processes. In particular, little is known about the effects of daily emotion regulation practices on counselors' mental health and work outcomes, despite the fact that emotion regulation is often a moment-to-moment process. Understanding how novice career counselors—who may experience heightened anxiety and vulnerability—use daily strategies to manage emotions could provide valuable insights into fostering resilience and sustaining well-being. Furthermore, job well-being is shaped not only by personal coping mechanisms but also by workplace resources and demands, such as supervisory support, workload, and the quality of professional networks. Therefore, it is essential to investigate how these personal and environmental factors interact to alleviate or exacerbate anxiety. The present study aims to fill this gap by adopting a daily-diary approach to examine how novice career counselors' day-to-day emotion regulation practices influence anxiety and overall job well-being. By moving beyond static, cross-sectional perspectives, this study will provide a more nuanced understanding of the fluctuations in counselors' emotional experiences and work satisfaction. Findings are expected to inform practical strategies and organizational interventions that support the mental health of career counselors, ultimately enhancing the effectiveness and sustainability of career guidance services in a post-pandemic labor market.