The ending was poorly thought out. It broke the characters past believeability. The reasons it gets a score as high as 7, are that the story was sort of interesting, and the acting was quite a bit above average.

It has a big problem that is common in dramas nowadays.
The writer seems to have given up on the ending.
At least in this drama, it is only the last episode that is really poor.

It may be a good idea to follow some of the actors from this drama.
The male and female leads are good.
The Shiori-san character is pretty good.

Good beginning, mediocre middle, bad ending. Do not recommend.