First off, I just want to say this is an OCN drama.  If you know nothing about OCN, let me summarize it by saying---OCN is a station that specializes and from what I can see, exclusively focuses on mystery/detective dramas.  I have not seen a single romcom/human drama/tragedy (unless related to mystery)/horror---all of them are detective/mystery.  Considering I'm a mystery/detective buff fanatic in any culture - OCN is my channel.  In Japan I live for Tantei's.  Therefore, if you plan on watching and love it/or/ you're already a detective/mystery buff OCN is the place you want to be. ALL their dramas are a hit in my eyes.  None of them are alike except for being mysteries.

The Good:
The actors are really good and mesh well with each other. The flow of the stories are nice; I like that there are continuations of a story to bring some type of closure (this does lead into the bad).  I like the bromance between the two lead characters.  Actually, it's not a bromance,  that would be disingenuous; it's more like camaraderie.  I love the fact that the mysteries when solved didn't have happy endings.  I loved the injustice that's been pervasive through the story an you know will happen at the end; but also the fact the ending is so ambiguous--because it's a prediction.  I think the ending makes up for some of the sins.

The Bad:
Female lead...she was just fodder.  I know a lost of cyber/computer tech characters that have been used properly.  She was worthless to me.  She had one bottle episode and the rest of the time she was around to make the male leads feel better about themselves when they were feeling down.  Just no substance.  The only female with any substance and gumption and I actually wanted to see more of was the pathologist.  Similar but she wasn't there to fluff anyone. Not to mention I'd have like to see the pathologist lead because she's an older woman.  These dramas always bring in the spring chicken (I don't care if she's my age).  

I really didn't get the leads backstory.  Or in all honesty I felt they were poorly executed, so I didn't get what I wanted from them.  Definitely the case with the leading male.  Ugh. his story was confusing as hell.   I think that was what slowed down a lot of my watch time.  Not to mention; some of the stories didn't have proper closure.  In the sense that they had just weird endings and you're stuck scratching your head.  
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I would rewatch: But I would only re-watch certain episodes like the 1st one, red suitcase one (brilliant episode), and the con-artist one.