I first watched this drama last year as it aired, and even though some elements were a bit hard to follow at times, I thoroughly enjoyed it. I watched it with my sisters and we looked forward to it every day.

Now, I'm currently watching it over again with my mom, and let me tell you... it's almost a completely different experience.
In a good way. When you know what's going to happen already, you can concentrate on the smaller details you didn't catch the first time that'll make you go "OHHH NOW I UNDERSTAND".
It makes you realize just how much hard work and attention to detail was no doubt put into this drama. Ad it'll be just as, if not more entertaining then the first time you watched it.
So trust me, if you've only seen this drama once, watch it again. This rewatch is a pleasant surprise.