Hiya, Would anyone have any suggestion for a "One-Day Skiing" trip in Seoul? Thanks?

1.there seems no ski resorts in seoul,but in kang-won do(강원도) and kyong-gi do (경기도)there are many ski valleys.both are not far away from seoul
2.the most famous ski resort in south Korea is yong pyong(용평) resort aka dragon valley maybe
3.most of ski resorts will be open from December maybe
4.ticket price : 50000won more or less
5.keep warm,be careful,have fun