THIS: http://gogumafics.livejournal.com/ Is like the heaven of all Yongseo fanfics. Everyone is good there but you want to read some thing good? Look for ohmygirl, ladylia, kerubechan, tims_tams, and a LOT of really good authors as well as Yongseo stories.

Oh, I know someone. He has two fics done. Uhm, I am on my phone so I can't give you the link. But his user is aceofspades