Maybe this will help. I found some videos for the end credits screen of G1. There are others on youtube, just search "Mabinogi credits".
Anyway according to the video above...
Art Director - Rooney Yi
Character Designer - Popcorn Kang
Costume/Monster Designer - Akane Lee
Monster Designer - Nox Ahn
Scenery Designer - Sindorim Jang
Movie Designer - Ren Lee
Web Designer - Oz Yoon