Choongsunggong(忠成公), Gyun Kwon(權鈞: 1464-1526, GK) took positively part in Jungjong-banjeong(中宗反正) and became the fourth degree Gongshin(四等功臣). His ancestral seat(本貫) was Andong Kwon lineage and his birthplace was Moga Myeon Sanna Li. This thesis aims to investigate into GK’s Participation into incident of treason which was called Jungjong-vangeong, his lineage, and his activities. With go away the reign period from King Sejong to King Seongjong, in due to the Promulgation of the Great Constitution of the Kingdom, known Gyeongguk Daejeon(經國大典), the Choson Dynasty built on the centralized administration system, and begun to raise a high level of culture. After Yeonsangun(燕山君, YSG) acceded to the throne, in 4th year of his regime, YSG acted in collusion with the Hungu(勳舊: Meritorious Power) faction, begun housecleaning of the Literati Purge in 1498(戊午士禍) in order to castrate the Sarim(士林) faction, who claimed to stand for the moral sense theory by taking an initiative in political development. In other words, the moral sense theory was integrated into the Being a saintly monarch theory. After the Literati Purge in 1498, with the Hungu faction holding politically a dominant position with the royal palace faction, the reign of YSG fell into the extreme of decadence and corruption. Accordingly, the Sarim faction firstly tried to overthrow YSG, but the Hungu Faction took the lead in dethronement of the tyrant. GK comes from in Moga Myeon Sanna Li at Icheon(利川) of today. His ancestral seat(本貫) was Andong Kwon Lineage, and his another adult name was Jungkyung(正卿) or Yeongchang Buwongun(永昌府院君). He was appointed to the post of Woouijung(high state councillor) at the end of his life. According to Kwon O-Whon(權五勳)’s Yonggaoheonlok(永嘉言行錄), GK’s Family lineage had flourished enough to produce 9 BuwonGun in the late Goryeo Dynasty. GK succeed in State Examinations(科擧) at the age of 23, and had mainly filled government posts such as Taegan(臺諫). He tried to pass Samasi(司馬試) in 17th year of Seongjong’s regime(1486) and made the grade for the civil service examination in 1491. He assumed the office of Geomyeol(檢閱) in the Yemoonkwan(藝文館) and the post of Juseo(注書) in the Seungjeongwon(承政 院). In the end, he was promoted to the office of Busoochan(副修撰) in the Hongmungwan(弘文館, Office of Special Advisers), and simultaneously, took on the editorship of Seongjong Sillok(成宗實錄). However, he did not assume another government post, with the exception of Taegan or advisor post. In the first year of YSG, when the king proclaimed the installation of the Crown Prince, GK rendered distinguished services in the question of the Crown Prince, held an additional position of an instructor(輔德) in the Sigangwon(侍講院) known as the Crown Prince educational institution, besides the post of Sagan(司諫) at the Saganwon(司諫院). In a little time, he was selected for Dongbusungji(同副承旨) of the Saganwon. Under the reign of tyrant YSG, GK was nominated upper level positions such as Dosungji(都承旨) and work ministry(工曹判書), and had YSG’s deep confidence. Nonetheless, when YSG became an oppressive king, GK took part in Jungjong-banjeong. In my view, GK have enjoyed King Jungjong’s confidence, come into close relation with the New comers such as Cho Kwang-jo(趙光祖), and become a civil official and a scholar who work on positive lines in some of social reform.