The next paragraph completely spoils this entire series. stop reading now If you haven't finished.

It's entire series is killed by the penultimate episode. The main villain is pinned with over several thousands of pounds of concrete but in the span of 15 seconds despite literally on the verge of being crushed to death he's able to completely unpin himself, find a shotgun, and shoot the FL... Of all the things I've ever seen in a k-drama this is the thing that makes the least sense of anything I've ever seen.

It completely ruined the entire series and any enjoyment I got out of it. There's still over an hour left of this series and I don't want to watch it now because of the god awfully bad writing that I just witnessed.

you'll miss absolutely nothing if you skip this series, and frankly it's simply not worth it.