For me, I found this drama quite enjoyable, however, I don't feel that it was at its fullest potential. As far as story, I thought that this drama had a very interesting concept - focusing on the mindset of murderers. However, even with that interesting concept, I was still left with your run-of-the-mill crime/mystery scenarios. They were also pretty predictable, though weirdly enough, I felt that as each episode got more and more predictable towards the end, they also somehow simultaneously got more exciting. (Well, that's how it was for me anyway lol.) I also didn't like how the overall writing felt dumbed-down. When you have an interesting subject that dabbles into psychology, I think the last thing you should do is dumb-down the writing. Something like the mindset of a murderer is complex and I feel the writing should've reflected that. When it came to the cast, I thought that Saito Takumi and Kubota Masataka and the characters they portrayed had great chemistry. They were honestly, the main reason I kept watching. I thought that Hideo Himura was an interesting character and was immediately intrigued by the relationship dynamics between the dark Himura and the brighter Arisugawa. Besides the leads, I thought that the rest of the supporting characters and cast were also enjoyable, minus Yamamoto Mizuki who portrayed Kijima Akemi. I felt that Yamamoto's potrayal of her would fluctuate between dull or very exaggerated and that became pretty annoying to watch. There were also a handful of lesser characters that I thought were a bit over-exaggerated by their actors as well. Sadly, where I also thought this drama fell flat was in cinematography and editing. The amount of scenes in this drama where the actor would be placed in front of a bright window or light, so bright that the actors' faces would be washed out so you couldn't see their reactions, was annoying and happened way too frequently. That is like a filming no-no to not be able to see your actors' faces, yeah? Yes, a silhouette effect here and there can be awesome and add to a scene's tone, but if they were actually trying to go for that effect, I think they failed horribly. It just looked amateurish. As far as editing, I thought some of the scenes were edited awkwardly, most of the time I understood that they were trying to add tension to certain scenes, but most of the time, for me, it was too exaggerated which made it look amateurish and awkward at times. Overall, despite some of the negatives that I pointed out, this drama was still enjoyable. Even if you're not really feeling the mystery elements, you'll never be bored watching this and you'll probably still stick around for the two main characters anyway. (This was supposed to be a comment, but it was so long I figured I'd just make it a review lol.)