Amid the growing interest in Global Citizenship Education (GCE) with the rise of the international reputation of Korea, Korean schools have been collaborating with NGOs to implement GCE. This study aims to explore the characteristics of GCE delivered by NGO lecturers, how they understand GCE, and the limitations in carrying out GCE through a partnership between NGOs and schools. This study conducted a Focus Group Interview, and we found three main points. First, the NGO lecturers understood global citizenship education as an education that pursues ethics via the utilization of knowledge regarding the world. Second, the NGO lecturers were experiencing both conflicts and compromises when practicing global citizenship in Korea. Third, the cooperation between NGOs and schools is implemented in the form of outsourcing; and the NGO lecturers expressed concerns about the danger of certain GCE education providers monopolizing the education and the risk of varying education quality. This article makes a significant contribution as it helps understand the NGO lecturers who are the active participants of GCE but are often ignored; and the GCE delivered from them. Moreover, it contributes by providing a thorough understanding of how the partnership between NGOs and Schools played out and discussing its limitations.