This study aimed to develop medieval Korean materials. In the “2015 Korean education Curriculum,” the goal of Korean language history education was set to understand the nature of “changing language” by realizing the differences between medieval and modern Korean. It was judged that the selection of “medieval language materials” was important to the success of Korean language education. To explore the vocabulary change, “Hunminjeongeum” “Examples on the Use of Letters” was selected. Analysis is expected to enable changes in the form and meaning of vocabulary to be grasped, and changes in phonology and notation can be understood. To explore the change of hearer honorific expressions, specific scenes of “Seokboangjeol,” “Wolin-seokbo,” and “Letters on the excavation of Suncheon Kim’s grave” were selected. This is because declarative, interrogative, and imperative forms of “쇼셔, 야쎠, 라, 니” are used throughout the short texts of “Seokboangjeol” and “Wolin-seokbo,” which are story texts with a plot with which learners can gain interest and empathy. “Letters of Suncheon Kim’s grave excavation” contain stories related to the ancestors, so learners can gain empathy through the text. In addition, “” of the 16th century, which is considered as a succession form of the “야쎠” of the 15th century, can be found in the text. Lastly, the first scene of “Byeonyeok-Nogeldae” was chosen to investigate the change of interrogative forms. It is considered different from other medieval materials as the whole text is composed of dialogues, and interrogative forms of (-Upper), “-nda, noun+ga(go), -nga(go), nyo(ryo, ryeo),” are also used in short scenes.