I just love this drama not only because it stars Lee min ho, but also because of the story and the concept were just amazing. I know the drama has been criticized for its slow pace, but trust me you will feel that for maximum first two episodes. Its obvious that when someone from another world will approach the parallel world it would be weird and therefore its slow. Its worth watching. Its not confusing, if you watch it with full attention you will understand it eventually. But yes if you just wan't to watch some random cheesy romantic kdrama apparently for which you won't need much attention then for sure this drama can't be in your watch list.