Sekolah Minggu Yeollin mengadakan pengintegrasian pembelajaran iman untuk menyatukan firman Tuhan dan praktiknya. Tetapi guru mengalami kerisauan tentang kesenjangan dan ketidakseimbangan antara konsep dan praktik kasih karena selalu terjadi kekerasan, bullying, dan konflik di dalam kelas padahal praktik kasih adalah inti firman Tuhan. Oleh karena itu, guru mengadakan tindakan perbaikan dengan Penelitian Tindakan Kelas melalui penerapan Contextual Teaching and Learning (CTL). Tujuan penelitian ini adalah: (1) mendeskripsikan proses implementasi CTL yang dapat meningkatkan konsep dan praktik kasih, (2) menganalisis perkembangan konsep dan praktik kasih siswa, dan (3) mengidentifikasi kendala-kendala dalam implementasi CTL. Penelitian Tindakan Kelas (PTK) ini dilakukan dalam 3 siklus di kelas IV Sekolah Minggu Yeollin, dengan subjek 9 siswa. Data dikumpulkan melalui observasi, catatan lapagan, dan tes, serta dianalisis secara deskriptif-kualitatif. Hasil penelitian menunjukkan: (1) tindakan perbaikan dilakukan sesuai dengan langkah CTL dengan penyempurnaan pada siklus berikutnya; (2) terjadi perkembangan konsep sampai 79% dan praktik kasih 1 sampai 89%, dan praktik kasih 2 sampai 77%; (3) kendala-kendala yang dihadapi antara lain kemampuan bahasa Korea siswa yang terbatas, keterbatasan waktu pembelajaran, dan kurangnya dukungan orangtua. / Yeollin Sunday School has established a faith-learning integration curriculum to integrate God's Word into practice. The teacher has been concerned about constant violence, bullying, and conflicts in the classroom even though the practice of love is the core of God's Word. Because of this problem, the teacher applies Contextual Teaching and Learning (CTL) for a corrective action. The purposes of this study are: (1) to describe the process of implementation of CTL that can improve the concept and practice of love, (2) to analyze the development of the concept and practice of students‟ love, and (3) to identify the constrints in the implementation of CTL. This Classroom Action Research is completed in three cycles in fourth grade of Yeollin Sunday School, with 9 students as the subject. Data were collected through observation, field note and tests, qualitatively and descriptively analyzed. The results showed that (1) the corrective actions undertaken in accordance with steps of CTL with improvements in the next cycle; (2) there was a development concept of love up to 79% and the practice of love 1 up to 89%, while the practice of love 2 up to 77%; (3) the constrints are the limitation of students‟ skill in Korean language, the lack of instructional time, and the lack of parents‟ support.