designs - about 25% of South Koreans are Christian, and I agree that they do tend to be enthusiastic, and maybe doctrinally adventurous. I once had a visit (they door-knocked the apartment block in which I live ) from a group of attractive young Koreans (wait for it) to invite me to the memorial of Christ's death." Oh! I thought, Korean JW's," and invited them in. Turned out they were not J/witnesses, but somehow they had picked up on the same thought of an annual memorial. Their English was not so good, and my Korean non-existent, so communicating ideas was difficult. Could not find out a name tag, as they insisted that they were, "just Christians, doing the will of Jesus." And, that the Bible was their sole guide, not the thoughts of humans.
Oh, well! Been there and said that too.
There is a historical closeness in thought among East Asians (Vietnamese, Chinese, Koreans and Japanese) that underlies the relationship between these nations, in spite of apparent contemporary difficulties. The relationship between Koreans and Chinese is even closer, as they share a past connection, like 'lips and teeth' as the saying goes.