Kim ok-kyun, the leader of the Enlightenment in modern Korea, went through the process of imitating Japan's modernization model and gradually realized the one-sided transformation.The fundamental reason for Kim ok-kyun's change of outlook on Japan is his continuous contact with Japan, his in-depth understanding of Japan, and his changing relationship with Japan. Although the concept of "Sanheism" was not realized, but the change of Kim ok-kyun's view on Japan is still has a great significance to the development of modern Korean and East Asian history.