Chief of Staff is definitely different, 'mostly' in a great way. It managed to pull of a serious story that illustrated many issues in the world we live in today, with a hint of realism that isn't apparent in other dramas of it's kind (politics genre etc.). I really liked the production, especially in filming and editing of this too, and while, story-wise, I felt like I desired something that wasn't there, I was still impressed from the end. The first couple of episodes are quite slow but eventually by the third/fourth episode you'll get into the story more. Acting was top-notch quality by nearly everyone, accompanied by a great OST.

Re-watch value is normally low for me anyways, so don't read into that too much. If you are a fan of these kinds of dramas, I definitely recommend watching Chief of Staff. If you are new to this genre, of haven't watched a great deal, I would suggest something different for you as it may not be to your taste. All in all, a decent watch.