Saseolsijo that uses extended Chinese poetry and prose for its materials shows aspects of prosifying and lengthening. Due to its length, Saseolsijo using extended poetry and prose becomes lengthening and due to its prosaic characteristic of chinese prose, it becomes prosifying. Saseolsijo t hat us es epic narrative a s its materials s hows p ros ifying a nd lengthening aspects. Due to epical elements of its narrative, Saseolsijo becomes prosifying, and due to the length of its story, Saseolsijo b ecomes lengthening. In t his cas e, sijo contains lyrical genre that is more of epic which allows more frequent use in Saseolsijo to expres s poet`s thoughts as well as introducing epical stories in short. Saseolsijo that uses daily conversations as its materials demonstrates prosifying and lengthening characteristics. Daily conversations contain a much of prosaic characteristic which makes Saseolsijo prosifying, and conversations tend to be repeated to become longer which makes Saseolsijo lengthening. In this case, to emphasize story of a poem, methods of enumeration and repetition o f s ame expres soins are u s ed. This typical e xpression method l eads to a elongated poet which results in a more prolonged lengthening aspect in Saseolsijo.