Though he failed to find the herb, he encountered Jeongbang Falls on the way and he left his autograph, Seobul Gwaji (which literally means "Seobul was here"), on the cliff wall, where it no longer remains. An inscription on the wall of the waterfall saying "Seobulgwacha", refers to Seobul's journey.
Though he did not locate the herb, he stumbled upon Jeongbang Falls along the route and left his signature, Seobul Gwaji (meaning "Seobul was here"), on the cliff face, where it no longer exists. An inscription on the waterfall's wall that reads "Seobulgwacha" refers to Seobul's expedition.