This study is a study on the experience of Wee Class counselors in adolescents with mental illness. The purpose is to understand the counselor’s experience with mentally ill youth from a service provider’s perspective. For the study, in-depth interviews were conducted with five wee class counselors. As a result of analyzing the interview data using Giorgi’s phenomenological research method, there were a total of 3 components and 10 sub-components. The three components were ‘parents of great influence’, ‘making change’, and ‘insufficient service system’. ‘Parents of great influence’ is the situation that counselors experience the most in the service providing service, and the units of meaning appeared as ‘disturbing parents’, ‘realizing the role of family’, ‘helpful parents’, ‘parents treatment decision making.’ The units of meaning of ‘making change’ were ‘being placed on site without a weapon’, ‘using external resources’, and ‘feeling rewarded with small changes’. The units of meaning of ‘insufficient service system’ was ‘need for an integrated service provider’ and ‘need for close cooperation between service providers’. The results of the study are three-dimensional with understanding of mental illness adolescents, counseling competency, and service provision environment. Based on these results, practical and policy suggestions were made for adolescents with mental illness.