The purpose of this study was to examine the moderated mediating effect of self-compassion through internalized shame on the relationship between adult attachment and anger-in. In this study, 448 subjects older than age across the country completed self-report surveys. Data were analyzed for mediation, moderation, and moderated mediation effects using SPSS 25.0 and SPSS PROCESS Macro 3.4. The results are as follow: First, there was a positive correlation between adult attachment (attachment anxiety, attachment avoidance), anger-in, and internalized shame. There was negative correlation between self-compassion and the others. Second, internalized shame showed partial mediating effect in the relationship of adult attachment(attachment anxiety, attachment avoidance) and anger-in. Third, self-compassion moderated the relationship between adult attachment (attachment anxiety, attachment avoidance) and internalized shame. Fourth, the mediated effect of internalized shame was controlled by self-compassion in the relation of adult attachment (attachment anxiety, attachment avoidance) and anger-in. These findings show that self–compassion has a buffering effect that reduces the internalized shame that has a signiticant impact on dysfunctional anger expression (anger-in). Based on these results, the limitations and suggestion of the study are discussed.