Story (5.0):
The story was off to a great start in my opinion, regardless if there are a fair amount of elements you have to turn your brain off to believe. But especially past the half way point, it really fell apart and didn't do much for me. It was honestly boring even when stuff was happening because I wasn't invested in the story line. I think it's because before watching I was expecting a bit more of a romance like My Little Bride, a bit of romantic comedy, and after the first 30 minutes I was also expecting one of those underdog success stories. However, in the long run, it didn't fulfill either tack for me; yes there's some fun romance stuff, and some good success, but it didn't commit to either and so it failed on both.

Acting/Cast (7.5):
This is mostly the only thing carrying the score for this movie. I actually like the two main characters and I even mostly like them together. And they can obviously dance. The dancing was probably the most interesting to watch besides a few fun moments (like inspection for fake marriage), but it wasn't like stunning or anything. The "big" and "new" dance movement that supposedly set them apart wasn't super special and they had to do special cuts on that scene anyway.
Almost all the other characters are completely irrelevant and flat, though there wasn't any noticeably terrible acting.

Music (5.0):
Well, come on, it's mostly dance music...

Rewatch Value (5.0):
I don't ever see myself watching this again. Even Geun Young's My Little Bride, which can't be called a masterpiece by any means, was way more fun imho.

Overall (5.5):
I think this could have been a lot more than it turned out to be. It's not a terrible story, but it didn't really touch me or stand out in anyway, or even leave me feeling satisfied. Still, I'm not super upset I watched this. It had its moments.