This study examined the peer supervision experience of school counselors by understanding the beginning, the process, and the subsequent change of peer supervision experience. In-depth interviews were conducted with nine school counselors experienced in peer supervision. The data collected through in-depth interviews were analyzed through the consensus qualitative research method, and a research team composed of three evaluation teams and one auditor participated in the data analysis process. Next, 3 areas, 13 categories, and 36 sub-categories were derived. While counselors use supervision as a general method to counsel students, the supervision method may be difficult to process and use because of the counselors’ workload. Therefore, the school counselors in this study used the peer supervision experience method as it was more efficient and was able to relieve the burden that the school counselors faced. Participants connected emotionally, formed local networks, and understood counseling tasks and roles through the peer supervision process. Following the peer supervision method, I experienced changes such as improved expertise and sense of identity and solidarity and increased motivation. Based on these results, discussions were conducted, and the practical significance of school counselor education, academic significance, and limitations of peer supervision research were presented.