I criticised a lot but you know it's a 9. It is a good drama. Go ahead and watch it!
Overall, I gave it a 9 but looking at other things u know it doesn't deserve this bias of mine.  Not fond of the two leads. thought I gave the acting of the male lead's actor a go after haven't watched him in anything for a long time and his acting is not favoured in the Jdrama-community. So what am I even biased about?  I can't figure it out. I just like it for it being able to coerce the lazy me to watch one episode after another and after another. . .
- Only 5.0 for acting/cast coz they can't emote to the maximum. The young lead actress delivers sometimes but cannot sometimes. Aside from the 2 leads,  many casts are all good.  The police was great and the male lead's mom did the best acting job, second would be Kento Kaku.
- Story is 9.0 coz I like the twists, but the director shouldn't have hinted at EP8 about who it is coz smarter viewers would already be guessing right on who that is.  That hint was so obvious. Should have waited until final episode to shock viewers.
- Music: 5.0 coz I like Leo Ieiri . If I didn't like her I wouldn't even rate this this much. The way the music is used it is tooooo much; annoying is a harsh word,  and it is not annoying at all, so I would say the soundtrack is just not optimised. Scenes that shouldn't have it should not have it playing over the moment they are doing some big thing, revelation, or an epic scene, or a crucial scene. The song just makes it awkward and cheesy.
- Rewatch: 1.5  for all the reasons above.

but I'm satisfied with having watched this show. It is not a regret. It is a good show.  Recommend for everyone.