The good thing for me in this drama was the music, as someone that has listened to Hikaru Utada for decades. That's where it ends.

The cinematography (landscapes, mood, light, colours) was good and I enjoyed some of the scenes purely because of it but it's not enough to recommend this drama to anyone.
The story is based on the very cliché amnesia trope, I was hoping I wouldn't have to see that plot device used again ever but here I am. Everything else is pretty much destroyed for me because of that, everything becomes absurd and ridiculous and very easily solvable but they keep hammering their heads against a wall in veeeery slow motion, because the show is quite slow (and I say this as someone that enjoys slow shows/movies when they're done with grace and purpose). This show could have been a film, would have been better.
I get they're trying to appeal to the nostalgia of that type of shows, amnesia trope was so overused in late 90s and early 00s in everything so I had my fair dose of it and got very tired.
Something that also irked me was the zero resemblance of the main character with her younger self, I could kind of see it or imagine it with him, but her younger self was just complete opposites and made no sense.
I liked more the little story they showed of the son with the dancer.

Overall I regret wasting the time watching it, but it also brought me down memory lane with the music. That being said, I still would have preferred to spend my time listening to the music alone than watching it (because it's not like they used all her music for the show either so it did get a bit repetitive in that aspect as well). So, unless you like amnesia as a plot device I can't recommend.