Confucian principles. Taoism, which has been handed down since the Goguryeo period, had Daecheong-gwan in Kaesong, and after the relocation of Hanseong, Sogyeok-jeon was established and Doryu was placed as a season, taking charge of Samcheong and Seong-jin. In addition, the worship of the Crown Prince (關王) was transmitted to the people. As fortune-telling, secret divination, and Gam-rok spread to the civilian population, ideas such as hermitage, the last days, the rebellious revolution, and fate permeated the people deeply. Catholicism As the Joseon dynasty entered into the modern era whilst keeping the state in relative isolation, it soon faced the problem of the transmission of religions from the West. Catholicism(천주교) or sometimes called seogyo(서교; 西敎) was introduced in the late 18th century as a part of Western thoughts and studies(서학; 西學; soak), but it was banned for the following reasons. By washing away one's sins with salt and water, one receives the favor of God. Jesus came down as God, died, and ascended again to become God, and is said to be the godparent of all things and people's lives. Catholics ignore filial deeds by referring to parents as physical parents, calling the spirits of ancestors the devil, and rejecting ancestral rites as demonic events. It is an unchangeable principle that if there is yin and yang, there must be a couple. They call it virtuous that a man and a woman do not marry or marry, and that is falsehood, and those who are younger than him mix men and women, disturbing public morals. According to the former, the human race will perish; according to the latter, humanity will be clouded. From having no father and no king to even married couples, what else can I say? When various names such as Holy Mother, Bride, Young Se (領洗), and Confirmation (堅振) appear, the more they appear, the more it is like a goblin. As such, Catholicism was secretly spread by missionaries infiltrating the country despite the prohibition, and it led to multiple persecutions by the court during the 19th century. This persecution was not only caused by the unreasonable religious policy of the court, but also by actions that went against the Confucian ideology and policies of Joseon. For example, the Hwang Sa-Yeong White Book incident, which was caused by Catholics to seek freedom of religious belief, lead to the worsening of Sinyu Persecution(신유박해) in 1801. Donghak Due to