https://www.lonelyplanet.com/points-of-interest/yukdam-pokpo/1453911
Yukdam Pokpo | Seoraksan National Park, South Korea | Attractions - Lonely Planet
Yukdam Pokpo is a series of six waterfalls and a pond.
seoraksan national parksouth koreaattractionslonelyplanet
https://www.lonelyplanet.com/points-of-interest/gwongeum-seong/1454045
Gwongeum-seong | Seoraksan National Park, South Korea | Attractions - Lonely Planet
These remains of a fortress are thought to date to the 13th century. The easiest and quickest way to get here is to take the cable car.
seoraksan national parksouth koreaseongattractionslonely