Having the main lead changed was a very huge loss to the production, yet they were able to make up for it with some extravaganza stuff that is completely out of this world. An ulimate world building of complex systems with a full blown religious war that spans across the far stretched political spectrum. All the buildups that lead to the action sequences were perfectly executed in great cinematic techniques and how it plays out with the plot is just extremely clever. It is truly a visionary production for Netflix Korea, unbelievably intense from the start to finish without a break, a complete madness that will leave everyone speechless for sure.