The number of North Korean migrants who arrived in South Korea reaches about twenty five thousands. This ethnography examines a mega-church’s training program that is the most active and systematic among civil organizations working for the migrants’ adjustment processes in the South. With consideration of the North Korean mission field as a North-South Korean cultural contact zone, this article elaborates main concerns that are experienced in the mutual culturalization processes between South Korean Christians and North Korean migrant trainees. It highlights that while Christian scholars suggest the necessity of understandings about North Korean society and North Korean migrants’ particular life trajectories in helping North Korean migrants, such cultural relativist approaches are feeble in reality. That both North and South Koreans are perplexed in encountering cultural differences reflects a myth of cultural homogeneity fostered in both North and South Koreas, and an enduring Cold War consciousness emphasizing South Korean cultural superiority over the North. Under the division system, North Korean migrants’ past life and identities in the North tend to be degraded as negative Other, and thus their conversion from Juche Ideology to Protestantism is teleologically promoted. This article demonstrates that an ideal North Korean migrant who acquires capitalist norms and Protestant ethics to be a future missionary for national evangelization is projected by South Korean Protestant expectations. Such cultural project tends to drive North Korean migrants to feel both burdened and empowered in terms of future oriented predestination. And yet I argue that North Korean migrants should be recognized and subjectified as equal counterparts rather than objectified to learn and follow South Korean ways in the North-South Korean cultural dialogues.