The purpose of this study is to exam adolescents’ psychological and emotional issues through rap music therapy. Nine adolescents aged 14 to 19 years old attending community child center in Seoul were referred by the social workers. It was purposive sampling for the study. Rap music therapy focused on writing rap lyrics was conducted once a week for 50 minutes, total 10 of sessions, from March 14 to May 16, 2019. 75 songs written by the adolescents were analysed by content analysis method of Roberts and McFerran. 389 lyrics and 60 codes were identified from 75 songs and the codes were categorized into 5 themes. The lyrics content analysis revealed the following themes: ‘self’, ‘negative emotions’, ‘relationship dynamics’ and ‘positive emotions’. The remaining codes that did not fall under the three themes were categorized as ‘miscellaneous’ which included codes related to the military, money, smoking, alcohol, diet, etc. To provide some detailed explanations on the 60 codes, ‘situations perceived by self’, ‘positive future image’, ‘value attitude’, ‘emotions about the opposite sex’, ‘perception of self’, ‘perception of others’ and ‘feeling of physical inferiority’ were some of important codes that were identified. The findings of this study suggest that music therapy intervention using rap is an effective clinical tool to unveil adolescents’ values, concerns and other factors that are necessary for psychological and emotional support.