Iv'e notice this drama in 2013 after i have seen the Korean remake (called "The Suspicious Housekeeper" that i liked also )
The difference between them that i understand now after reading some reviews is that the Korean virsion is more Digestible and the western viewers can relate to while if you into Japanese dramas and Japanese culture you can relate to this maybe more then the K virsion.
What i feel about the Japanese tv is "Still waters run deep" , it's slow and revealing piece by piece with some kind of deep emotions that hard to understand , and maybe the view on the woman is different
The korean version is more memorable as times go by now after a couple of years i can see the empact on me.

worth a watching