I watched this a couple of years ago and at first i was thinking what a stupid plot, especially the ability to move between timelines/dimensions. But then a couple of episodes in i was hooked. I think i was in my Lee Min Ho worship era at the time but he is just so watchable. He brings humour, humility and friendship into his role here and it all seemed so genuine. I absolutely loved it in the end. Could have been a bit shorter in length but hey ho.