When I first discovered Asianfanfic, The Ballad of Twelve Sinful Angels was one of the fanfic that I read (and absolutely adored). It is an extremely well-written fanfic that will leave you on the edge of your seat. Please go and read this fanfic right here:-

http://www.asianfanfics.com/story/view/528468/the-ballad-of-12-sinful-angels-angst-mystery-romance-angels-exo

I wanted to thank her for writting up such an incredible fanfic for us readers and so I dedicate to her this poster I made. I hope you like it author-nim!