This is the very first korean drama that I've watched and I must say that it set the expectation bar so high for others. STORY: I gave it a 9.5/10 because it was just A+ for me. The alien stuff weren't too overboard which I really liked since I am not really a fan of that genre. The progression of the story was perfect - it was neither slow or fast. It provided just enough tension to keep me wanting more! ACTING/CAST: I can't really comment on the acting as I've only watched Kim Soo-hyun and Jun Ji-hyun just once but I must say that they are really good in internalizing their characters on screen. They were really good in playing their parts, especially Jun Ji-hyun! I really thought she added more flair to the show. Plus, their chemistry was off the roof! It's as if they're dating in real life (I wish though!). MUSIC: I have no problem with the music. The soundtrack that the producers have chosen are fit for the scenes. Did I mention that I still catch myself singing the theme music every now and then?! REWATCH VALUE: If you were to ask me if I'll watch this again, I would say yes! I know there are some heavy scenes here and there but this is really a feel good drama for me. I'll probably watch it when I'm feeling down or sad to lift my mood. OVERALL: I guess this is a best way to introduce myself to the world of k-dramas because it never disappointed me! I loved it overall and I would definitely recommend this to everyone!