ºÝºÝߣshows by User: seunghwanyoon / http://www.slideshare.net/images/logo.gif ºÝºÝߣshows by User: seunghwanyoon / ºÝºÝߣShare feed for ºÝºÝߣshows by User: seunghwanyoon https://public.slidesharecdn.com/v2/images/profile-picture.png 나 윤승환. I am Seunghwan.