I hate when one simple thing causes such a big mess, totally can relate >.<
I like your idea behind this, I think it's actually a really good one but I'm certain it become extremely elaborate! For instance, who is this girl? How did a relationship develop between Joon and Mir while he was dating this girl? What happened next? Etc etc. To me this is sort of like a foreword or insight (maybe flash forward?) from the beginning of a sure to be epic story!! I hope this helps, I look forward to seeing what you do with the pairing next!! They're my fav ^-^ subbing and adding you in hopes of reading more awesomeness!! Fighting!!

I like the story,but maybe you should make it longer,add some plot,it would be more interesting for readers :)
I'm really sorry if I'm being rude :/
I believe that you'll write some awesome stories in the future and I'll be honored to read them :)
I apologize once again for being rude.
I wish you all the luck in your future work :)
FIGHTING!