Since the introduction of the Catholic Church in Korea, the Church experienced many persecutions and the Byeongin(丙寅)Persecution was the most representative one. Although it was carried out in earnest from 1866 to 1873, there are not many studies on this issue. And, there is no specific study on the Catholic believers who were caught at the time of persecution in Gangwon area. This study examined the official records such as “Podocheongdeungrok(捕盜廳謄錄)” and “Chuangeupgukan(推案 及鞫案)” and Church resources such as “Byeonginchimyeongsajeok” and “Chimyeongilgi” in order to examine the motives of becoming Catholic believers and practices of beliefs in Gangwon area. Catholic believers in the Gangwon area meant those who were born and raised in this area, those who escaped here, and those who were caught in the area. Catholic believers in Gangwon area figured out through “Podocheongdeungrok” and “Chuangeupgukan”, “Byeonginchimyeongsajeok” and “Chimyeongilgi” are as follows. Firstly, 64 people were identified as Catholic believers in the Gangwon area. As for the gender ratio, men were 45 and women were 19. Men were twice more than women. Secondly, among 64 people, 41 were clearly identified as coming from the Gangwon area, 17 were those caught in the Gangwon area, and the remaining 14 people were from other areas and were caught in Gangwon area. 23of them were born in Hoengseong(橫城), and most of them were living in Hoengseong area when they were caught. Thirdly, 26 out of 64 people showed their motives of being Catholic believers. Among these 26 persons, 4 people were admitted to the Church by family and 17 people were admitted by their acquaintances. 5 of them were admitted because of personal disease, which indicated that they were admitted for the next world oriented mind. Fourthly, they were tied with family relations. Out of all 61 people, 30 were identified as family members. This implies that the Catholic clan village formed a community of faith based on a blood relationship. Fifthly, in their practice of faith, 49 out of 64 people had baptismal names. Thus, most of them seemed to be baptized. Yet, only 4 of them have received confirmation, and only 4 read the catechism. It seems that they learned catechism via oral education and recitation rather than the concrete study through the catechism. This can be a distribution of doctrine through oral tradition, which is the way in which the doctrines of Catholicism were transmitted and maintained in the midst of hardships and long persecution. Such is their faith. Sixthly, the arrest timing of 64 believers in Gangwon area was 1868, the Mujin(戊辰)Year. Seventhly, among 64 of the Gangwon area believers, 3 mentioned apostasy directly, and the remaining 61 people chose martyrdom by saying 'I expect your disposition' or 'I cannot apostate'. Among them, 9 believers were disposed as “Mulgo(物故)” which means that specific type of martyrdom is not identified. 21 were identified for their martyrdom as hanging.