This study was about an a Female adult who diagnosed with Autism Spectrum Disorder, Unspecified Depressive Disorder, and Attention Deficit / Hyperactivity Disorder. The researcher tried to deeply understand and explore the possibility of art therapy as a therapeutic alternative. This study, as a single case study, conducted a total of 23 sessions, 90 minutes once or twice a week, and executed two follow-up studies, after 3 months and 8 months of art therapy based on qualitative analysis. The analysis results were as follows. First, the nine major themes from the art therapy experience were as follows: ‘the expression of fragmented past emotions and memories,’ ‘the reproduction of the psychiatric symptoms of the past,’ ‘connecting fragmented memories,’ ‘facing inner conflicts and inner dialogue,’ ‘conflict resolution using creativity and the sense of accomplishment,’ ‘settling positive internal resources,’ ‘entering a new world and making decisions,’ ‘the expression of unresolved wounds and the establishment of self-reliance,’ and ‘visualizing the present integrated with the past.’ Second, 6 meaning units were derived from the meaning of the art therapy: ‘self-understanding,’ ‘facing and direction-seeking,’ ‘direction change and center shift,’ ‘the achievement of psychological balance,’ ‘the rise of consciousness,’ and ‘growing slowly in life.’ Based on these research results, the significance and limitations of this study were discussed.