Deuk Gu Shin(1850-1900), Nongsan as a pen name, was the Confucian scholar, who had lived between King Chuljong and King Gojong. As you know, in the Chosun Dynasty, on the basis of cultivating the mind, managing the home, governing the country, and pacifying the world, Confucian scholars tried to cultivate their own mind in advance in order to rule others. And so, in order to cultivate their own mind, they tried to make their own will sincere and their own mind right . And then, in order to develop their own sincere will and right mind, they tried to abandon their own desires and follow the laws of nature. Because the origin of this moral philosophy study had been from Jeongia and Chu Hsi in China, and Toigye and Yulgok in Chosun, in case of violating the teaching of these originators, they killed each other as heretics. Also, in case of arguing their own new theory, they ruined both themselves and their family. So, this moral philosophy study could not progressed a little from the theory of Chu Hsi. Here, Scholar Deuk Gu Shin could not be the except but the case for a victim as such heretic. In that his "Rikiron" and "Insimdosimbo" had infringed the theory of Yulgok. his controversy with Byung Seon Song(1836-1905), Yunjae as a pen name, occurred, so that, as the party of Yunjae demolished his house, destroyed his furniture, and tried to exile him far from the capital, owing to these oppression, suppression, and pressure eventually he committed suicide.

• 朴金奎(圓光大學校 師範大學 漢文敎育科) | Park Geum Kyu