Okay, to start off with: I noticed 3 things.... 1.) I watched this special episode AFTER finishing the full 11 episode drama, and saw no issues. 2.) Granted, a little bit was backwards and upside down... 3.) May need to prepare tissues! Starting off with number 3: It wasn't that serious, so no worries; but if you're an easy crier, or tear up when you see others cry... get tissues. Now jumping to number 1: I didn't see any issues watching this special after the 11 episode drama; there was a cast change (not mentioning names), but otherwise it seemed just like a flash back to the past. It was the story of how the Qualified class was formed, but I don't think that matters in regards to watching order, unless you're a stickler for watching dramas and/or specials in order Now to number 2: Yes, because of watching the prequel after the drama I had questions; yes, if I watched the prequel AND THEN the drama that probably wouldn't have brought up questions; and yes, it may have made a bigger impact on me or made more sense as a show in it's entirety. However, there was nothing revealed in this special that wasn't known in the drama already, so it wasnt like I missed out on some thing(s). And the drama has enough strength and stability as an 11 episode show to carry itself. I'm not saying this special was unneeded, don't get me wrong! But, I am saying the order doesn't matter in which you watch them... at least I think so! This, I'm sure, if I watched before the drama, would have been a great prequel; but, because I watched it after the drama, it served as a nice follow-up or wrap-up to the series. I definitely recommend this special and the 11 episode drama!