Sung-Doh Oh and Dong-Ju Lee have served as cooperative missionaries with World Witness since 2008. They are working with All Nation Mission. Sung-Doh is now working for rebuilding Churches. He is licensed by First Presbytery and ordained by Bethel Korean Church; he graduated from Andong National University with a degree in music and also earned his MCM and M.Div. degree from Erskine Theological Seminary.