Reformed churches encompass the ones in Europe, the Scotland Presbyterian churches, the Presbyterian churches initiated by the Puritans of England, and the congregational churches. In a broader term, Methodist and Baptist churches belong to the tradition of the reformed churches as well. However, because Methodist churches lack this sense of belongingness and Baptist churches developed Moonistic understanding of faith, it would be proper to exclude them from this category of reformed churches. Most importantly, we must not forget the Russian reformed churches that have survived the long suffering and persecution to keep their faith. Russia officially accepted Christianity in 988. However, because the early clergymen were of Greek descent, no effective training and education could take place. Thus, most emphasis was put on ceremonies and rites instead. Hereafter, simony prevailed and became rampant. This serious problem was exhibited through the crusade formed within the church. But the religious and governmental authorities started to oppress the crusaders, and they even executed many ardent followers. Because the reformation movement lacked a trained and educated leader, it became a small sect of cult in itself. The fist Russian Calvinistic community is a product of the influx of the reformed community of Lithuania that resulted from the territory distribution. However, it became weakened after forming a coalition with the Lutherans. During the reign of Ivan IV (1547-1584), the number of foreigners drastically increased, and many foreign experts in different fields were brought into Russia. And among them were many followers of Martin Luther and Jean Calvin. Thus, Lutherans and reformed churches made an early appearance than the Roman Catholic churches in Moscow. Furthermore, during the reign of Peter I, the number of foreign believers of Lutherans and Calvinism increased dramatically yet again, and these churches transformed themselves as evangelical churches in the society. Beginning in the late 1980s, the Eastern Europe Communist bloc was opened to the western world. This signified the spread of the Eastern Orthodox Church, one of the three Christian divisions, to the areas predominated by Roman Catholic and Protestant Churches. As the cultural, political, and economical exchanges took place between the East and the West, Christians of both regions also started to form close relationships with each other through cooperation, missionary work, and service. In the past, while Russia was still under the Communist rule of Soviet Union, our nation (Korea) was in an antagonistic relationship with Russia. Therefore, no official interchanges occurred between these two countries. However, after the collapse of the Soviet Union and liberation of Russia, the suspended Korean missionary work reconvened in Russia. In particular, the Presbyterian Church in Korea actively participates in the Russian missionary work even to this day. Nevertheless, it is difficult to find a scholarly analysis of the achievements of the Korean Presbyterian missionary work in Russia. Before we go any further, it is critical to carefully examine the history of the complex protestant church reformation in Russia, which plays an essential role in forming traditions and customs in the country. As the history tells us, the Russian Protestant Church has been continuously persecuted and tortured under the oppressive Communist regime. But that dreadful process has produced a large number of martyrs as well. Not only have these martyrs established a holy tradition, but they have also served as the everlasting testimony to the persecutions of Communism, Russian Orthodox Church, and traditional Shamanism. However, this treatise concentrates on studying the reformed tradition and history of Russia.