It's about a girl who is a perfect women, soul or something, and demons are trying to capture her to impregnate her and release a demon that will take over the world or something. It's about gods and demons who reincarnated into people. I remember the main good guy is reincarnated from a war god or something. I also remember the first time it happened he failed and killed himself and his lover so that they could reincarnate later to be together again.
that's about all i can remember. it was Korean i think.