First Forest Lodge Opens Within Seoul’s City Limits
I think the article meant Mt. Surak not Mt. Seorak. Mt. Surak is the large mountain that the old Camp Stanley in Uijeongbu is located at the base of. Mt. Surak is definitely a great place to escape the hustle and bustle of Seoul:

A new forest retreat has opened on the slopes of Seoraksan in northern Seoul, offering city dwellers a rare chance to unplug in nature without leaving the city.
Surak Hue, which officially opens Thursday, is Seoul’s first public forest lodge built within city limits. The 23.1 billion won project ($16.7 million) was jointly developed by the Seoul Metropolitan Government and Nowon-gu over seven years.
Located in Nowon-gu’s Sanggye-dong neighborhood, Surak Hue is built across 9,800 square meters of woodland and features 25 rooms in 18 buildings.
You can read more at the link.

