Here are three very short videos of the Orthodox Christian Church in Korea. I think these are from the Saint Nicholas church in Seoul. Orthodoxy in Korea originates from Greece, just as in Japan it originates from Russia. The main difference is the style of music and the icons. The church singing in Korea is the same as in other Greek churches. The faith believed and practiced is the same as in all Orthodox churches throughout the world.
For additional information on the Korean Orthodox Church, visit their site in English or Korean.