After the 16th century's japanese invasion, the main thoughts of literary class of Chosun on japanese culture in general was a lower and savage one. One of reasons of this underestimation is surely the feeling of Chosun's literary class that the civilized people was forced to be through the savage period of their history. After the 17th century, Japan invited some high-class literary class to Japan so that the new relationship between Korea and Japan could be reestablished. But, armed strongly with their culturally superior feeling on that of Japan, Chosun's literary class who went to Japan never succeeded to see the reality of Japan, that is, the progress of Japan. This article examines the concrete aspects of this “blindness” throughout the letters, formal reports and the informal sayings of this literary class who went to Japan so that this tragic history will never to be repeated again.