Help Finding A Manga/Manhwa

So I remember awhile back when I found a manga or manhwa not sure where the main character worked at a library I think and could see like vengeful spirits and then there is a guy who works as a detective/or something rather and can exorcise them. I remember he stepped in when the guy was helping him solve a crime with a girl who had been murdered and they ended up finding out it was several victims I think. Anyway, does this ring a bell for anyone? I feel like the main character was black haired and the other main character (detective or whatever) had light colored hair. Thanks in advance!!