Neither the title referring to the green jackets worn when volunteering for the school, nor the poster showing a group of 5 women around age 40, reflect the series, which is more of a thing developing as it goes. Per se that is not bad as life is like that.
These are imperfect people, with very few characters emerging from the mess, ... again mimicking life.
We get to see rich people, middle class folks, people with debts in terms of money, earlier experiences and other forms of debt. Again, such is life.
The "sin" of the writer is that she could have done a better job at directing the viewers (e.g., all the stuff about the education of the kids is just abandoned somewhere in the middle of the series), which as per some comments, felt that they had seen different genres, different series all blended. Failure to do so renders the job of the writer redundant. Personally I have a huge problem with the coincidence of having so many people presented as neighbors and sharing a past.
Kudos regarding one detail: the step brother and sister adopted in France came respectively from Korea and China, and that is exactly what happens in the world of adoptions: Korea tended to allow for the foreign adoption of boys, while China tended to allow for the foreign adoption of girls. The French used by both is however really disgusting and cannot reflect the respective adoptions.