First-year adaptation support courses enhance student retention, improve academic achieve ment, and strengthen students’ sense of belonging and adaptation to university life. Most universities conduct first-year adaptation courses as small-scale first-year seminars or prerecorded lectures to facilitate interaction between faculty and students. However, to foster students’ sense of belonging, utilize university resources efficiently, and provide uniform information to a large number of students while maintaining consistency in both information and education, it is necessary to implement large-scale collective education for first-year adaptation effectively. This study analyzes the development process of a large-scale first-year adaptation support course at A University, located in the Seoul metropolitan area, evaluates its effectiveness through a pilot implementation, and proposes improvements based on the findings. The students expressed a high degree of satisfaction with the practical information provided, such as university life guidance and learning strategies. Regarding instructional methods, students considered face-to-face lectures and experi ential activities more effective than online lectures. Additionally, students preferred courses with clearly defined learning objectives and assignment plans, showing greater satisfaction with univer sally applicable topics than with lectures focused on specific academic disciplines. The effectiveness analysis yielded the following key implications for course improvement: structuring course content to reflect students’ needs, expanding face-to-face lectures and experiential learning activities, establishing a continuous assessment and feedback system, securing institutional support, and strengthening interdepartmental collaboration. These improvements enabled the first-year adapta tion support course to be systematically designed, developed, and implemented, facilitating first-year students’ successful transition into university life.