Amazing. You never knew what was going to come next with SKY castle. It was the perfect mix of suspense, and realism about the upper-class education systems, albeit slightly exaggerated. I love how they dived into mental issues because of continuous pressure (Youngjae) and how arrogant some people tend to be, even towards their mother (Ye-Seo). It also had some comic relief, mainly with Su-Han's family. I love how chill Yebin was. And, the pyramid was just the highlight.