China ,South Korea, and Japan in East Asia in comparative study of culture, is the scope of cultural exchange. At present, the frequent inter-regional economic and cultural conditions of friction to similar themes and topics to find out the culture of the border, from a different language environment and cultural background to explore the development of a multi-cultural cross-point, which in Comparative Culture research topic is worth exploring.China is the birthplace of Confucian culture, and with China, Japan and South Korea and Japan are affected by Confucian culture, but has a connotation of a different nature. Both stressed the "good guys" and "filial piety." There are differencesbetween the two . This paper attempts from the two countries "One concept of" starting from the analysis of one aspect of the cultural differences between the two countries and its deep-rooted social roots. This article is divided into six parts. Introduction In the first chapter, the thesis outlined the purpose of the study, to study the scope and approach. Defined in Chapter II "One," the source of moral values and concepts, and analysis of the "good guys" and "filial piety" the relationship between. Chapters III and IV, respectively, on to Japan and South Korea’ s "One, " the acceptance of moral values, Japan, "Chung" moral values and the "ex" the link between and the Republic of Korea, "Chung" moral values and "ceremony" between Contact. Chapter V in Japan and South Korea through the "One"—the effects of morality and hwarang Bushido Road, Japan and South Korea "home" system of comparison, the emperor worship comparison, analysis of Japan and South Korea between the two countries, "Chung" cultural differences point. Chapter VI is the concluding part.Learned through the analysis, although the two countries, Japan and South Korea are of the same circle of Confucian culture, but the theme of different cultures to make a wide range of interpretation of reality. Therefore the formation of a special "One" to the culture. The purpose of this paper the two countries, Japan and South Korea through the "One" of the comparative study of ethical culture, clearly have their differences and the reasons for differences. Japan and South Korea hope to cultural comparative study between the two countries to help provide that.