This paper aims to examine the unique evolutionary process of traditional music and its characteristics by looking at the creation and succession of Steel-string Ajaeng sanjo. Sanjo-Ajaeng, which is mainly used for dance, continues its legacy as a solo instrument whereas Steel-string Ajaeng has been insufficiently transmitted. Thus, this study investigates the creation and spread of Yun Yun-seok’s Steel-string Ajaeng and re-examine the existing research and transmission value of Steel-string Ajaeng. For this purpose, the paper will look for the essence and value of transformation through the records of Yun Yun-seok's Steel-string Ajaeng performances and the process of completing Shin hyun-sik’s Steel-string Ajaeng sanjo style which is inherited from Yun Yun-seok. Yun Yun-seok je(body) Shin Hyun-sik ryu(style) Steel-string Ajaeng sanjo was completed in the form of sanjo by supplementing the limitations of improvisational research. In particular, he embraced all the characteristics of Gayageum and Ajaeng and searched for musical language based on sanjo to compose Ginsanjo with various rhythms. Also, it is hoped that creative inheritance methods like Steel-string Ajaeng Sanjo's composition principles will be widely used for the development of traditional music.