This is probably one of the best kdramas I have seen till now. The plot, the acting , the graphics and the direction were all brilliant. It was quite confusing, but it just makes you want to watch more episodes. The cliffhangers were clever and the twists and turns in the plot were great. The cast members had to perform two very different roles for their characters in parallel universes , which was very entertaining to watch. Everything seemed to fall into place with the progress of the story and there were huge, unexpected events in the following episodes. For people who are looking for action, romance and suspense, I think this is a good option.