At first I was rather bored by this show and irritated by Kim Go Eun's character, however as it progressed I really came to enjoy it and watch it every day. The story at the start and especially how Park Hae Jin's feelings for Kim Go Eun changed for me was quite bizarre and how the change happened not fully understood. Perhaps he had feelinggs all along? but initially twisted, unable to relate to or trust people normally? The conclusion as is often the case in these dramas annoyingly used the fairy wand time-shift device and was nice and neat but not very credible in some respects. However for me a very watchable drama. I liked Seo Kang Joon the best. Lee Sung Kyung provided some comic moments but with some not-so-comic flaws in her character [well-acted I think]. Park Hae Jin's. character was interesting and I liked the development from the aloof, calculating persona [whichPark Hae Jin plays very well] to his character at the end. Kim Go Eun was sweet, but one of those characters I feel like shaking into life, to react instead of letting things happen to her. It seems everything happened around her with her passively at the centre. She played that character well if that is what it was supposed to be. I also liked the supports. Really good drama once it took off from the slow start. May rewatch again but not soon.