Title:
The title at first glance isn't that original, I've seen titles like this one before and it's not something I'd click on if I saw it, to say the least. Don't get me wrong, I can see why it's called "Person of Interest" because it's pretty obvious by the description itself so the fact that it can relate to the story is good. Overall though, the title isn't that eye-catching or very unique/orginial but I think EVERY writer is guilty of having titles that aren't mindblowingly exotic.

Description/Foreword:
The descripton kind of screams "cliche" because of the fact that Hanbin is the popular one and the OC is the loser. I've seen it over a thousand times (that's a bit over exaggerated but I'm sure it's been done on this website over a thousand times) so it kind of tells me the plot may be a little, or very - this depends, cliche itself.

The foreword is a little preview to the story I'm assuming (this is me before reading, of course) and it kind of seems like it could be cliche but I've learned to never judge a book, or fanfic, by it's cover/description so maybe my views will change on the story completely afterwards.

Plot:
Just by the first sentence, it seems kind of cliche because there's the popular girl, or just girl in general, who makes the OC's life a living hell at school and, sometimes, outside of school. I don't know how school life is in South Korea as I've never attended school there as of right now but, where I'm from I've never seen a popular person that gets a lot of attention; boy and girl wise. I've been to many, many, schools and I just don't get why there's always that one popular girl that is usually a /bully and popular playboy (or nice popular guy) in stories. 

Also, I don't get how no one has noticed her before - I mean in school, you'll at least see someone once if they've always attended the place. And since the so-called es of the school harass her, someone else would have noticed her even if she was just walking to class. It's kind of weird how just no one has noticed her.

Writing Style/Flow:
The writing style is pretty good though, I usually prefer 3rd point of view since that's my own preference. You made this point of view work with the story though so that's a good thing. As for flow, I think it's decent because you don't want the story to go TOO slow but you don't want it to go too fast either - I think the flow is somewhat in the middle which is a good thing. 

Characterization:
Hanbin seems quite demanding- though it was said he did have a slight temper, or big temper, so I can see how that can tie into him being demanding.

The OC stutters a lot, she seems to be very easy to put under the bus and easy to give anxiety. I don't know if it's because she's nervous, which is pretty likely since apparently no one knows her and thinks she is new, or she has speech impediment which I really doubt. She kind of seems like the generic OC character but at the same time, she does have a bit of uniqueness in her since I haven't really seen an OC call the male an "" yet.

Personal Enjoyment:
The story's not for me personally but it's not bad. I think you put in a variety of characters which is good since it doesn't always focus on the OC and the main character. I wouldn't read it on my own will since I don't read these types of fanfics nor do I read OC fanfics but I think it's pretty good for what it is.

If you have any questions let me know and if I forgot to mention something, you can murder me HAHA.