I adored this drama- its was incredibly well written and kept you guessing until the very end. The plot is very intricate and would need full concentration otherwise you may miss something- however, with a drama this well executed its doubtful your attention would stray. The story is flawless, which is why I give it a 10. The pacing was perfect and gave you enough time to make your own judgements on everything and then leaving you utterly surprised at the twists and turns of the plot. While the series is fast paced the time given to each small arc is paced well and you don't feel like its rushed. The cast is perfectly chosen- the acting is superb and the cast is incredibly in tune with each other pulling off any scene with ease. There were 3 actors who really made this show perfect for me- Miura Haruma, Satoh Takeru, and Narimiya Hiroki. I would like to especially mention the latter at his portrayal of J was chilling and so well acted I was almost rooting for the character just because I wanted to see more of him. The cast is a perfect 10 for me! I admit I didn't really pay much attention to the music- however, the bits I did pay attention to were incredibly well executed and I saw no fault with it. With some shows he music can be a distraction and with Bloody Monday I barely noticed it which to me indicates how well it actually fit with the show. So I give the music a 10. The rewatch value I would also put at a 10, because while there is a second season I will be watching this again. Overall, a flawless and spectacular series!