Background: The purpose of this study is to verify the mediating effects of dissociation experience, relationship addiction, and internalized shame in the relationship between complex trauma experience in childhood-adolescence and interpersonal trauma in adulthood. Methods: Two hundred and thirty-eight adults participated in this study. They were administered the Korean versions of the Trauma Antecedents Questionnaire, Impact of Event Scale-Revised, Dissociative Experiences Scale, Relationship Addiction Questionnaire, and Internalized Shame Scale. The data were analyzed with descriptive statistics, correlation analysis, reliability analysis, and structural equation modeling. Results: First, dissociation and internalized shame had a double mediating effect in the relationship between complex trauma experience in childhood-adolescence and interpersonal trauma in adulthood. Second, relationship addiction and internalized shame had a double mediating effect in the relationship between complex trauma experience in childhood-adolescence and interpersonal trauma in adulthood. Third, dissociation, relationship addiction, and internalized shame had a triple mediating effect in the relationship between complex trauma experience in childhood-adolescence and interpersonal trauma in adulthood. Conclusions: Therapeutic intervention for revictimization should address symptoms such as dissociation, relationship addiction, and internalized shame. In addition, people with complex trauma experiences in childhood-adolescence require preventive intervention to avoid further exposure to interpersonal trauma.