I was so looking forward to watching this when I first saw the trailer, but it didn't turn out as great as I wanted it to. Maybe my expectations were too high. The mystery/thriller element of it is fun and entertaining; the love story is ok. I'm really not a big fan of the going out-breaking up - going out again format. It's boring.
Moon Ga Young and Ye Soo Jung always seem so natural whichever characters they play and this was no exception. Yeo Jin Goo's Gye Hoon was a disappointment. It wouldn't matter so much if he was a supporting or guest role but as the main character, too much melodrama in a man doesn't add anything to the show, but rather the opposite. Perhaps he wasn't the right actor for the role or he didn't play it well. That's just my opinion. What do I know?
I think the hand to the chest when their emotions link is a bit too much. Maybe a simple visual effect would've sufficed. I'm sure the flow of the story would've panned out the same way without that kind of melodrama. My other gripe about overly melodramatic scenes is the idea of bawling their eyes out first instead of calling an ambulance or untying a victim.
Overall, it's still entertaining enough not to be dropped. I feel like there was more content in the final episode than there was in the final half of the series put together, bar the last episode obviously.