 Wŏnhyo’s various writings show the first major systematic inquiry into the fundamental metaphysical reality of the world on the Korean peninsula. His work Treatise on the Ten Ways of Resolving Controversies (Simmun hwajaeng non 十門和諍論 in Muller and Ngyyen 2012) not only influenced Fazang and Cheng-gwan among the Chinese masters but also Gyōnen, Zenshū, and Joto in Japan.