[Objective] This study explores the operational process of a core competency diagnostic system implemented at University A to support future talent development. Using a case study approach, the research analyzed the experiences of 24 undergraduate students who participated in the system, including diagnosis, expert consulting, and follow-up activities. [Contents] The diagnostic process included regular and optional testing, simplified result reports, and a structured consulting model. Students reported that they were able to interpret their results, reflect on their competencies, and revise their learning plans. Key strategies such as consultant role clarification, professional training, and pre-diagnostic guidance were found to enhance student engagement and understanding. [Conclusions] The findings suggest that a structured and supportive diagnostic system can promote students’ self-awareness and competency development. This case provides a practical model for other universities seeking to implement or improve competency-based education and assessment.