Why such a low rate? :( It is good!! I love c-dramas where FL is strong-willed and speaks her mind, and this turned out to be one of those dramas. I really enjoyed it.
I don't know what the point was of adding new characters and side stories since they wouldn't follow them up properly. At the end everything was rushed, a lot of characters died senselessly, and the because the story is so complex, it couldn't be shown properly in these couple episodes...
Anyway, my respect for the girl who plays "I-Su." She did an awesome job.
Didn't like it. Not because it was a bad drama; it actually is good, has a good story and all, but I didn't like the characters, I guess. And the story - for me- was a little boring and too long. I was expecting a lot of action, so that was a bit disappointing.
It would've been better if the last 4 episodes had subs but oh well. The drama synopsis should reduce to "A kind and caring woman is murd*ered by serial rap*sts and killers. She doesn't want to let go of her human life, specially her boyfriend, so she becomes a vengeful ghost who takes revenge on all of those people who hurt her." It's not the best drama I've watched but it's not the worst either so I would recommend to watch it if you don't have anything else to watch and want something different.
I think it's a good drama to watch. Feels like it's the first lakorn that doesn't drag the story and it makes sense (most of the time). FL, in my opinion, was smart and assertive. Yeah, she was treated like a doormat by her family but she had her reasons. She was kind and sympathetic and she stayed true to herself. ML was a bit aggressive sometimes, but given the life he adopted , I guess it makes sense.
Celebrity 
I love c-dramas where FL is strong-willed and speaks her mind, and this turned out to be one of those dramas. I really enjoyed it.
Anyway, my respect for the girl who plays "I-Su." She did an awesome job.