Our guide said this falls flows year round, which I wasn't sure about given how relatively light the flow of the falls was. But it was conceivable given the stream mixes with some geothermally heated water higher up the mountain to keep the stream from freezing over completely. We also noticed some fish in the Green Deep Pool, which we suspected must've made it further downstream from Heaven Lake. Our guide said the fish were non-native to the area because a former North Korean premiere was said to have released some fish into the previously fishless lake, but somehow managed to thrive in the harsh climate here.

It only took us about 30 minutes to do the round trip walk while checking out the falls. The combination of boardwalk and trail started just beyond the so-called Landscape Restaurant, which was a basketball gymnasium that was used as a large dining hall for lunch.