This study’s aim was to empower South Korean adolescent girls to explore their creative potential and emotional world by implementing a six-session art intervention with a smartphone stimulus in a therapeutic setting. Within a culture of high expectations for academic achievement, adolescents can experience varying degrees of stress and anxiety, which can contribute to a range of emotional and behavioral problems. Thirty-three Korean adolescent girls received an art therapy intervention with the following components: (a) leveraging the smartphone as a motivational stimulus, (b) introducing response art as an opportunity to elaborate on smartphone imagery, and (c) inviting participants to dialogue with their art. Engagement in these activities was measured quantitatively along three dimensions, motivation, response art, and dialogue, through a researcher-developed instrument, the Participants Engagement Scale. Paired t tests comparing mean scores from the first to final session showed participants’ engagement significantly increased along all three dimensions (p = 0.0001), supporting the hypotheses. Qualitative data in the form of process notations were analyzed thematically to provide context and further insight into the efficacy of the intervention. The findings demonstrate that Korean adolescent girls respond positively to a therapeutic environment that respects their culture and in which they feel safe enough to share their stories in an exploratory or playful manner via their own creative expressions.