I've read some of the other reviews and I think some people don't enjoy this show because it's not relatable to them. The story is intricate and well written, a rare combination. And the acting and production do the writing justice. The story is concerned with themes of empathy (or lackthereof), revenge, and ethics. If these themes do not relate to you, you likely won't enjoy this show. If they do, you're in for a good time.

The only complaints I have are: (1) the blatant product placements (it's not too annoying though) and (2) the explanations of the various plots of the characters are sometimes delayed to the detriment of the story. However, do not let this deter you from watching it, I still highly recommend it to anyone interested.

Stories of romance sometimes revel in sentimentality a little too much but this one is an exception.
In the interest of brevity, I'll end my review with this: give it a shot.