Hands down this is the first drama I've watched in a long time that didn't have me wishing to fast forward on any part. I don't know if it's the best drama that I've watched (probably not), but right now it sure feels like it. The writing was simply superb. It's amazing how they paid attention to each little detail. There weren't any holes anywhere. There was nothing that wasn't explained in some point of the story. The whole story had me in my toes the whole, waiting too see what was going to happen next.I loved the way they used an unoriginal concept and turned it into something completely different, without using the usual things. For example, I loved that Boong Do was so practical and smart, and that instead of focusing on how much he was lost, he focused on learning all kind of new stuff and trying to adapt to the future. I also liked that both times in the story were important, not just the future. The cast was perfect. The chemistry between Yoon In Na and Ji Hyun Woo obviously can't be denied. I hadn't watched anything with Ji Hyun Woo in it until now (I'll be sure to correct that mistake), but I had watched Secret Garden and The Greatest Love with Yoon In Na, and I never thought possible she could be that good acting. That just proofs that looks DO deceive, because I thought of her as just another actress playing small mean roles. The secondary cast was great too, if sometimes a little annoying. The music was really according to the drama. It's not something I'd have on my iPod to listen to all the time, but it did fit perfectly to the drama. It was so good that even the actors used it to get in the mood for the sad scenes, how awesome is that? I'll definitely rewatch this sometime soon, when I'm in the mood for some epic love story. Overall, a pefectly well deserved 10. PS: This has some of the best kisses I've ever seen on a drama! Enjoy watching!