This paper investigates the possibility of applying fantasy in literary therapy through a case study. For this purpose, in-depth interviews with adult men were used as well as literary therapy using Kim Chun-soo's fantasy poetry as a medium. Existing literary therapy had limitations in accommodating participants with strong defensive tendencies by using allogeneic therapy using lyric poetry as a medium, but heterogeneous therapy was used to stimulate and reveal the participant's unconsciousness. This paper used Kim Chun-soo's fantasy poetry as a literary therapy style to complement the limitations of peer therapy and shed more three-dimensional light on the participants' inner lives. Following Todorov, who defined fantasy as 'the reader's hesitation between wonder and grotesqueness,' Catherine Hume said literature is a product of mimesis and fantasy. In other words, it simultaneously mentions the imitation and fantasy elements of individual works. Kim Chun-su is a poet who stubbornly adheres to fantasy and meaninglessness. The psychoanalytical approach of literary therapy uncovered the psychology and childhood memories latent in the unconscious level of the participants, and applied the concepts of symbols, active imagination, and archetypes through an analytical psychological approach. Gestals theory emphasized the experience of ‘here and now’ and examined it as an integrated organism of body and mind. Based on this theoretical background, through the work of expressing and rewriting reminiscent images through drawings, realistic fantasy enabled participants' creative experiences and helped provide a space for participants' arbitrary interpretation. As participants became more aware of their distorted inner self, they showed surprising reactions and revealed their inherent unconsciousness in a highly metaphorical manner. Of course, it cannot be said that the participant's tangled emotions were completely healed during the short session, but a positive aspect was discovered in that the participant had a desire to learn about himself. It is suggested that research on fantasy poetry texts needs to be conducted in earnest in the future.