The notion of selecting students based on academic achievement into different schools at certain points in their educational careers is one that has long been contested in education. In this paper I consider the role selective schooling may play in driving families' demand for private tutoring -- a phenomenon currently growing in many regions of the world. The paper explores the 'extreme case' of South Korea -- a country with some of the highest spending on private tutoring globally and also a long history of selective schooling. Drawing on interviews with experts and key stakeholders in the Korean education system, the paper reports a number of findings. Interviewees for this project were in many respects critical of a 1970s 'equalisation' of Korean schooling, though they also viewed moves back towards selection as fuelling 'shadow education'. Concern about this has driven governments to curb selective schooling for a second time in Korean history.