The writing is excellent, there is a lot of self-irony that is absolutely unexpcted in japanese drama.
The synopsis is a bit misleading. The driving theme is jealousy, but there are several levels of the stories
(yes there are several stories!). I found the acting excellent and the actors were very carefully and well chosen.
The whole is accompanied by the appropriate music. The short time of each episode contributes to an alert
rhythm; all unnecessary fillings were deleted. I was almost deceived by the final - a typical japanese one
- but the very last minutes are great: it is not 100% the expected japanese final!

Even if it is not the big revolution, this drama is much better than its actual renomee.
It is 100% worth its watching time!