I liked Moorim School very much, actuallly i'm impressed. It shows all the aspects of an actual human being, it's not about the common fictional characters. They're wavering  about their feelings, their dark and bright side, their principles. Also, it shows the power of love, such as friendship,family,romance and conveys messages about trust and loyalty. As for the plot, it's quite clever, especially the main hidden story of the drama.  The daily interaction between students and teachers built a great story and the fantastic element was a nice touch .Needless to say that there were many plot twists. The first half part of Moorim School was mostly a teen drama and the second half more serious, i liked this contrast. Acting, cast, music were totally satisfying.
However, it's a bit confusing at the end. One character changed very abruptly and we didn't see the fall of some villains.
I strongly recommend this drama, if you'are looking for something real and touching. As for action and fantasy, sure there are a lot of scenes, but i think that's not the point of the story.