For me, the most difficult is to write never ending story, because the story was from a mother's side. Well i haven't become a mother, so i don't really know how actually a mother feeling was..

For me, it'd be Milk Chocolate because it's not a one-shot and I don't know why I'm writing it in the first place.

im writing a fantasy atm (Eternal Winter, Immortal Spring) & it's difficult b/c u have to be consistent since it's a completely diff universe and stuff
yeah fantasies are always pretty challenging in that way ; ;

I just started writing a fiction about taeyeon and Baekhyun and because of the storyline which is still in my mind.. I think it's difficult but not impossible ^^ I just finished writing the foreword so there's no chapter yet :))