First of all Thank you my lovely friends for advicing me searching by web-achieve.
Now I can remind myself who is the original author and the lasted author who has had the right to continue the story.

The ORIGINAL story was published around TWO YEARS AGO; 2012/10/10(11) by Angel-Taoris,
and was gave away to RavenRose, and was gave away again to Orianna.

The web-achievement of the original story which was posted by the original author.
http://web.archive.org/web/20121204234813/http://www.asianfanfics.com/story/view/290099/arranged-marriage-with-6-demon-princes-hunhan-taoris-baekyeol-kaisoo-xiuchen-sulay

The web-achievement of the original story which was posted by the second author.
http://web.archive.org/web/20130628043113/http://www.asianfanfics.com/story/view/290099/arranged-marriage-with-6-demon-princes-hunhan-taoris-baekyeol-kaisoo-xiuchen-sulay

And the recommending which has showed the third and last author's name and the deactivated status.
http://www.asianfanfics.com/story/view/730494/148/exo--stories-exo-hunhan-taoris-baekyeol-kaisoo-xiuchen-sulay

The web-achievement of Angel-Taoris, the original author who's now in the military for good.
http://web.archive.org/web/20121204233640/http://www.asianfanfics.com/profile/view/246967

Now, what should I do?

'Cause I don't have any right to report the plagiarism content because I'm not an owner, 
and I don't know if Orianna still be here as an activated member or not.

Maybe I should ask AFF Helpers.