I don’t know which Protestant denominations are big in South Korea, but I am not surprised about this protest at all. The seamstress/alterations shop near me is Korean-owned, and there are anti-Catholic tracts sitting on the counter. (When they made my daughter’s baptismal gown I was careful not to mention which church she was getting baptized in.) There is also a picture of a huge crowd of Korean Christians attending a large meeting. I assume the picture was from Korea, and not a gathering of Koreans in America.
Primarily Presbyterian. And not the watered down American version.
Nearly a million Reverand Moon Christians still around?
Presbyterian, Methodist and Baptist. Based on their presence on FR, I know which one of those groups I suspect is causing the trouble.