The task for inter-cultural communication and inter-religious cooperation is a kind of ‘incarnation of faith(incarnatio fidei)’ that approaches to the ortho-practice which bounds all human race in real world. This sort of practice shows the hope of universally open religiosity and crosses the boundary of specific religions and various types of culture. Mutual change is available through this kind of communicative process. Such open-minded spirituality could be called as ‘mutual mission’ among different religions. It is far beyond compared with so-called ‘one-way mission’ of close-minded stiff religions. In that case, finally, inter-cultural communication and inter-religious cooperation can be accomplished in the strict sense of the idea. In this article is researched how such idea is perceived and tried to practice in the context of Catholic church in Korea. Concretely, it is scrutinized centering on Stephen Cardinal Kim who represents modern Catholic church of Korea and Rev. Mong-Eun Kim who was contemporary person of Cardinal Kim, and at the same time, practically dedicated for inter-religious dialogue and cooperation his whole life with extra-ordinary sense of duty.