context: Christianity in Korea is largely divided into two groups, consisting of about 9.8 million Protestants and about 3.8 million Catholics as of 2015 by the Korea National Statistical Office. [1] [2] In general, in the Joseon Dynasty, it is believed that the history of Christianity in Korea began when Lee Seung-hoon first introduced the Roman Catholic Church faith in the 18th century.
question: When did Christianity enter Korea?
answers.text: 18th century