The Diary of Modang by Son Cheonul have been estimated as the most detailed document that permit to figure out the process of restoration in the history of 17th Daegu Confucianism. It is Choi Heunggook to most frequently mentioned in his 30 years diary. Although this signifies to share many parts of their life, no search has been studied on the figure of Choi Heunggook. And then this essay made purpose to examine his life and poems, analysing the Diary of Modang. Choi Heunggook often referred to by his pen name Namgye(Southern Creek) and his courtesy name was Gamghoo. He was born on April 6, 1550(Myeongjong 5) in Oegok Yangsan. In 1588, he passed the initial degree, saengwen(生員) at the age 33. During the beginning of Japanese invasions of Korea(1592–98), he participated to resistance of Kyengjoo and Mt. Hwawang, against Japanese troop with Son Cheoyak, Son Lin from Daegu and Son Giyang, Park Shuchun from Miryang. Through these official and personal relationships, he arranged a temporary place to Changsandong in Daegu, where was reconstructing the confucian system of Daegu after japaneses invasions. At this time, on the side of Modang, Namgue Choi Heunggook played the role of connecting between Left and Right department Kyengsang.