Since I saw the original Korean version first, I can separate them both. Even so, i like the story and that is why i watched this.

STORY – the story is nice, but they cut some important parts that made this hard to follow. The fact that i knew the story could glue some loose ends in my mind.
An interspecies love, where we can almost forget, as most of the shows, that he's an alien. 400 years after, he rediscovers his love reincarnated. When everything was set for him to finally leaves Earth, love makes him having second thoughts. But he as to go and...
ACTING - I like the main leads acting. I think they did or shine more because of the plot and the writing. The other cast was also ok, but the screen time was low.
MUSIC - too mellow for me. Never felt that punch and strength that some songs can give.
REWATCH- i don't think i will watch this again. I already have viewed the k version twice and usually i don't do that. So, i prefer to revisit the original.
OVERALL - of course that i like this show. It would be better if i saw this first.