The rapid development of the internet and social media has transformed how individuals interact and access information, including among K-Pop fan adolescents. This study aims to empirically measure the relationship between fear of missing out (FOMO) and social media addiction in K-Pop fan adolescents. The respondents in this study are K-Pop fan adolescents aged 17 21 years who use social media for at least 6 hours per day. This study employs a quantitative method with a total of 122 respondents. The findings reveal that although the intensity of social media use tends to decrease with age among K-Pop fan adolescents, they are likely to experience an increase in FOMO levels.