This show is executed really well; directing, editing, etc. The cinematography in particular is artful and skillful. Shots feel composed and designed to complement whatever is taking place in the story.

The scenarios are realistic enough, and the acting is nicely restrained. The main actress Tokiwa Takako is super believable throughout; makes it easy to immerse in the story.

The music feels of the time the show was made; a lot of moody soprano sax - almost Kenny-G-esque. I thought it suited the show nicely, but it's a style of music that might annoy some people.

I was really satisfied by the ending - open-ended, but suspenseful. The last shot/credits roll was very cool.

Also, the running fridge ambience... the way it's used throughout the show feels intentional, but I didn't pick up on the meaning.

Overall, the show strikes a nice balance between melodrama and reality.
A sophisticated and tasteful show! Easily the best J-Drama I've seen so far (out of the 20 or so I've seen at the time of writing this) :)