Rtexal T.
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Most hikers coming to Seoraksan National Park will want to do this trek. Out and back with a blistering uphill (my 4 yo did it himself so it can be done!) at its last part, it is an invigorating hike, especially when you are on the exposed granite top. The view in good weather will be pretty awesome and the top area actually has a few view points that you can stop at for photos before descending back.