The purpose of this study is to reflectively explore the experiences of conducting art therapy with children from families of terminal cancer patients from the perspective of art therapists. As such, the researcher collected data through memory data, self-reflection data, participatory observation, interviews, and cultural artifacts that summarized the experiences as an art therapist during the sessions with children from families of terminal cancer patients. Based on the results of in-depth analysis and interpretation, the conclusion of the self-reflection experience as an art therapist is as follows. First, in art therapy for children from families of terminal cancer patients, the researcher realized unresolved issues as a therapist while exploring their own responses in a therapeutic relationship where children's anxiety is shared. Second, in art therapy for children from families of terminal cancer patients, the researcher could deal with death-related countertransference through reaction work dealing with personal loss and separation. Third, in art therapy for children from families of terminal cancer patients, the researcher recognized the internal change as an individual through the process and also discovered the role and identity as a therapist, experiencing inner growth.