Title: 3/5

No grammar mistakes, no capitalization mistakes. But... In my opinion, it's a bit long. Maybe "Marrying A Demon Prince." OTL that's bad. Never mind. But try think of something more creative, maybe? :P

Plot: 18/20

It's pretty original, actually. Very detailed in some points and pretty good. Except that I saw way too much 'arranged marriage' stories, everything seemed creative. Good job!

Grammar/Spelling: 13/15

Pretty good spelling, except for some typos (I understand them). The slight problem is the grammar or the punctuation marks. You misplaced them a bit--as in putting a period where there should be a question mark (look at the description first sentence) or putting an inappropriate comma in a place where there should be nothing. But overall, your grammar was... okay-ish? ;P

Flow: 19/20

Awesome flow. The reason I deducted a point was because it was kind of confusing at first. The prologue was pretty good, too! You are one awesome writer.

Foreword/Description: 9/10

Pretty good. (I use the word "pretty" too much, right? ;P) You introduced yourself after you summarized what will happen. Not too long, but minus one point for no character intros. Sorry, I like them :P

Appearance: 9/10

The background was neat and not messy, as in making everything too distracting and eye-hurting. It did what the background is supposed to do--support the story (?) yet make everything more prettier and set the general feeling. 

Characters: 15/15

I thought I would have a hard time with this story because (sorry) I only listen to EXO, but I don't know the members at all. But your subtle explanations of their style and personalities made me feel like I knew them. Good job. You managed to clearly define them. Full points! ;) Congrats!

Bonus: 2/5

When it's a group I don't know or a couple I don't ship, I usually give a 0. And I'm not a fan of boyxboy/girlxgirl stories. But this story, well, it was so well written that I wouldn't do it justice without giving it at least some bonus points. Very well written once again! 

Total: 88/100

Awesome job! A B+, if I may. XD Awesome story too. Hope this review helps!