During adolescence, youths may experience many unexpected changes due to sudden variances. At that time, youths were found to show rebellious or abnormal behaviors due to psychological wounds. These are often caused by psychological wounds oriented at home or at school, which may make some problems in adolescents' self-respect and attachment. In this study, we plan to conduct an analysis of the case of the interior therapy of educational facilities through TBRI (Trust-Based Relational Intervention) to discover how psychological therapy for youths is applied to an interior environment. The cases analysis are conducted based on the three principles of TBRI and the twenty seven detailed keywords within each principle. The research method is oriented on the research of literature focusing on TBRI-related external studies and domestic/external studies of interior therapy. The ranges of the case study are studied in six educational facilities retrieved and extracted from the website 'Archdaily' and from the 2019 Journal of the Korean Institute of Educational Facilities. The research article are concluded that TBRI's principles were applied to shape, finish material, color, lighting, furniture layout, plan layout, sculpture, and built-in-furniture by analyzing the interior therapy of educational facilities according to the elements of TBRI.