Songgang Jeong, Chul had been influenced by Sabu and Byungryumun as in Chinese Literature, yet he established his own Gasa genre into universal order of literature with his aesthetical sentiments permeated, and without any aspects or indications of Chinese Literature. The rhetoric skills foundation of Songgang is externally ordered by unrestricted elegant expression of delineation of his feelings or the nature and internally with the finesse contrast writing skills of Byungryumun which most effectively describes. Beauty of contrast writing skills which accord in pairs are not always found in dual opposite relations as in negative-positive dualism. As mentioned above, it could be found in principal and subordinate relations, ascending relations, resembling relations, as well as in assuming relations. Also, Songgang was extolled by Chosun poets for experimenting the acme of beauty of Korean Language which is composed of phonetic symbols other than fancy and charm of Chinese Language, an ideograph. Especially Kim, Man Joong stated in Seopomanpil that three volumes of Songganggasa had most genuine sentences in Korea and Sokmiingok, above other two, which was written in Korean, is most excellent work. Kim, Man Joong also said that other two were just no comparison to Sokmiingok due to Chinese phrases used in other two. Hence, Jeong, Chul is the most preeminent a Gasa writer as well as a poet of Chosun, established unique Gasa genre and enriched Korean Literature.