This thesis aims to gain understanding of the discipleship of scholars in the Joseon Era and the code of warriors of Japanese Samurai as the mutation in Confucian inheritability perceptive in the Eastern Asia and conduct a comparative analysis. In this study, the analysis was based on the comparison between scholars in the Joseon era who were the traditional ideal figures in Eastern Asia and Samurais. Thus the study has identified the discipleship of scholars in the Joseon Era and the code of warriors of Japanese Samurai, as Confucian-inherited mutation having the same Confucian DNA. However, similar yet different discipleship and the code of worriers had unavoidably different fates depending on the aspect of the modification. In this respect, the discipleship of scholars in the Joseon Era and the code of warriors of Japanese Samurai were mutant forms of modification on Confucianism respectively. The history of Confucianism has produced a number of different mutant forms and undergone a modification after modification to the present. The discipleship of scholars in the Joseon Era was a regular mutant form through the addition and compromises between other doctrines while the code of warriors of Japanese Samurai was an irregular form, developed by the mixing by the addition and compromises between other doctrines. Regardless, it would be safe to liken them to the half siblings born of the same root that is Confucianism.