Since i dropped it at the beginning of episode 19, the show has some good points.
The acting is good overall. The scenario is cliché but there is potential for a good drama.
I really loved the main actors and the others are also very good. Every actor is funny, beautiful or annoying so it's entertaining.

The problem is that the characters makes too many non realistic decisions, so much that it's not bearable anymore.
They have some developement since the beginning of the show, but it's not consistent. Sometimes they are smart and at other times in the same context they will be stupid. Sometimes they are lively then you don't know why they become lethargic...
Anyway the plot holes are so big that I don't even see my TV screen anymore. Almost everything could be resolved if they just talked to each other, that would weaken the villain so much... But even though they know that already, since they have experienced the feeling of sharing some information and thus not being thrown around like a trash bag, they still keep their mouth shut for no reason at times.
They know they absolutely shouldn't be alone with a killer and manipulative person, but they still go alone for no reason and afterwards suffer alone without telling anyone. And they see that the other is probably like them but still they continue ruining themselves.

Take the main character for instance : she becomes so smart and confident after she decides to help her husband, it's cheat-like (god mode ON), but then she seems to revert to a useless character, she begins sharing but afterwards she clams up.

For these reasons the characters are broken : I can't conceptualize them, they make no sense, thus the show makes no sense.
The villain especially : he is consistent in being unrealistic, he is even less human because they try to make you emphatize with him but it's not working. Also you can't explain why some lackeys are following him wich is very disturbing... what is in it for them, they can't follow him just for his good looks right ?

So in conclusion the show has potential, many people seem to enjoy it and so did I, but you have to overlook the many character flaws and plot holes. For me it's all I see so it's too upseting to watch.