Lee Min ho has done a brilliant job. He was acting with his eyes. I believed that there was another world and he was the real king! Omo! The female lead's acting was also very good. In fact everyone acted very well! And o-m-g the supporting actor and actresses' storyline were also very interesting. Normally I don't enjoy that much the supporting stories because they would be not much detailed and so on. But this one was really good.
But personally I think the chemistry lacked a little bit. Nevertheless, the romance and chemistry was not that important for me in this show. I watched it for other scenes.
The story was good. Of course there were some plotholes in the supernatural side. (But it is the same in all supernatural, science fiction dramas.) Generally the story telling was really good. There were some episodes, which felt like , they were written a little bit sloppy. Normally I guess how the things are going to end up, but there were lots of elements, that surprised me. Also I dont recognize seeing a more fullfilling and satisfying end and last episode for a long time!
So if you like sci-fi and supernatural stuff with good acting and good scenes, give it a go.
special note: The villains were very really good. LEE LIM was fantastic! I wanted more of his scenes :)