Maybe the worst drama I 've ever watched! I totally agree with the viewers that thumbed down that series before me.
-Story: Although it felt promising with a hint of Little Mermaid in it, it didn't go well from the half of the second episode. The characters were having an irrational behaviour, where the father begun as a villain and ended up as a pathetic criminal that was not punished. The FL had the silliest behaviour ever, as if she was suffering of mental dysfunction. The ML was saved by his charms as he put all the weight of his acting there since the script was not helping him at all. So many inconsistences in the story, that made it ridiculous.
-Music: was there any? The songs were annoying, the music was indifferent, overall it was as if it did not existed at all.
Bottom line: Don't waste your time with that. Watch something else.