In Korea, the Draw-a-Story (DAS) assessment is conducted to distinguish between depression and aggression and screen for the variables of emotion, self-concept, and relationship through response characteristics. Given that each study has different population characteristics and variables in their research design, resulting in consistent or contradictory results, it is of the utmost importance to use statistical validation to generalize individual results effectively. The objective of this study is to verify the power of the DAS assessment to differentiate therapeutic variables such as emotion, self, and relationship of children and adolescents in Korea. To this end, we employed the PRISMA flowchart to sift through research papers published in Korea by June 2020 and selected the final 15 studies for meta-analysis. The results are as follows. The first, both emotional contents and self-image scales have statistically significant effect sizes. The second, the emotional contents scale shows no significant differences between children and adolescents regarding effect sizes by research subjects. However, the self-image scale exhibits significant differences between the two types of study participants. The third, in terms of effect sizes by research variables, the emotional contents scale shows no significant differences among research variables, whereas the self-image scale presents significant differences. This study demonstrated the validity of the DAS assessment in differentiating multiple variables, including emotions, self, and relationships of Korean children and adolescents.