Hwansang Gotjawal Forest is the filming site of the BTS Young Forever Part 2 album preview video and the f(x) 4 Walls music video. A variety of flora and fauna reside on the lava terrain here, rather than soil. The forest showcases Jeju's unique primeval ecosystem. As you enter the landscape, created by the intertwined ferns and massive tree roots, you will feel as if you were in a different space and time. Guided forest tours are provided every hour. Reservations are required to join the tour.