This study aims to explore the key elements to facilitate public children's library services by investigating the current status and limitations in services. For this, data were collected through observations and in-depth interviews with library directors and children's librarians in public children's libraries in Seoul. The interviews were conducted based on the semi-structured interview technique. The content of the interview consisted of the vision and service status of the library, the competencies and roles of children's librarians, and ways to facilitate and improve children's services. The study discovered that libraries do not have a policy manual for operations and guidelines, and that their operations vary substantially according to the characteristics of the operating institutions. To resolve these problems, suggestions were made to facilitate children's library operations and services in order to enhance the professionalism of children's librarians.