Initial thoughts when listening to OST on Youtube without having seen any of Cinderella and the Four Knights episodes: "The music score is just SOOO good. Maybe this will be mind blowing....*few seconds later* Just watched trailer ---- looks pretty good."

After watching: UPDATE----- LOVE LOVE LOVE!!!!! SO GOOD AND OST WAS AHHHHMAZZZZZING!
Honestly, I was pretty hesitant to start watching this show because it looked really cliched, but it was actually really really REALLY good! I wasn't expecting to enjoy it as much as I did and I'm so glad I ended up watching it. It still stands as one of the best drama OST's EVER (for me personally), with each song sucking you in, feeling how the main characters are feeling.

The plot is pretty straight forward being a Cinderella story, but you shouldn't pick up this show thinking it will be unique, because, really, it's not. It's the same ol' story told in a fun, sweet, happily-ever-after, modern style way. The ending has all the loose ends wrapped up nicely and leaving you feeling super happy. I still watch the music videos on Youtube just to see the hilarity of the character dynamics and how the story inevitably unfolds.
I am not a fan of Cinderella stories traditionally, but this show is something I would gladly rewatch, force others to watch with me, and sing along the whole way through!