This study examines the teaching practices of a Korean Ganhwa Seon master to shed light on an effective approach to helping practitioners engage in Seon practice. Few prior studies have analyzed methods of teaching Ganhwa Seon, which is a traditional Buddhist practice for achieving sudden enlightenment. Using the CRISPA framework, which entails connection, risk-taking, imagination, sensory experience, perceptivity, and active engagement, we conducted a single intrinsic case study by observing and interviewing a Korean Ganhwa Seon master during a seven-day retreat program. The participating Ganhwa Seon master incorporated all six CRISPA elements, with an emphasis on active engagement, connection, and risk-taking. In addition, compassion was an essential component of Ganhwa Seon teaching. The findings distinguish the teaching of Korean Ganhwa Seon from the teaching of Chinese Chan, highlight the unique features of instruction in Korean Ganhwa Seon, and provide insight into effective ways to teach Seon practice.