Sky Castle was a phenomenon in Korea while airing, breaking all records for cable dramas, which is incredible because it didn't star the typical leads, though the veterans in the cast were all well regarded. The meteoric ascent of its ratings was largely due to its relevant premise in today's social climate, about what the rich in society would do to ensure their children go to the most prestigious courses and universities, as well as the extremely strategically used cliffhangers that effectively enticed viewers to come back for more.