Wisps of Darkness

uh... this story is actually based on a manhwa that has been discontinued. It is such a wonderful manhwa too, that I cannot get over it. So this is my tribute to the manhwa and my attempt to get more fans for the now-buried-under-mountains-of-new-manhwa manhwa.
Anyone who could guess which manhwa this story is based on will get 1000 brownie points. Also I'll write a better synopsis after somebody figured it out. Fret not. It used to be quite popular last year. If you're a fan like me you'll notice right away after reading the prologue.
Also I don't own the copyright since this story is not mine. But I'll take credit for the writing =)