I have to admit I really got excited by the title, but I'm not sure it's that much of a good idea. Now the story really has ended, and I don't know what they would be able to add to the main story... Min Joon Guk is gonna get punished, and Hye Sung will live happily ever after with Soo Ha (at least in my imagination!) so I don't see what they could add... On the other hand, they could make a lovely special, like you guys said, and maybe talk about the romance between Sung Bin and Choong Ki, that could be interesting!