I will update this comment (maybe) but so far, I'm done with 4 epis and although I am enjoying it and all, and the cinematography, OST are great and what not, and the plot is interesting overall, I still don't find it living up to the 'highest rated korean drama ever' title. And more importantly (personally for me that is) this isnt even close to beating Mr. Sunshine for me, at least not yet. Just a note: I don't usually watch k-dramas and this is one of the fewest that I'm currently following. Also, I started following Doctor Prisoner and it had me hooked from the first 2 epis already and comparatively I feel its somewhat better than Sky Castle. This could change in the near future however.