It could be said that the Korean Church has improved through continuous diverse debates and division in its history. The debate in Korean Church history has begun after missionaries who came in early Korean Church history, so that it became different denominations. It my theses, I will study the diverse debate forms in the history of the Korean Church. For this, I will divide the Korean Church history in several periods according to the most important events. The first period is the 1910's in this period the Korean Church was established. The second period is 1930's, where there was theological debate between conservative theologies and liberal theologies. The third period is 1950's, when the Korean Presbyterian Church began to divide. The fourth period is 1970's: in this period there was a lot of debate over indigenization and 'Minjung' theology and also the conservative theology which made the churches grow. The final period is 1990's, in this period, conservative theologians and church leaders made super-size churches expel two liberal theologians who tried to establish the Korean theology in a Korean context. In my thesis, I will study the debate forms of each period and transitional phases in Korean Church history. It would not be possible, of course, to study all the denominations of the Korean Church. Therefore, I will research the Korean Methodist Church and the Korean Presbyterian Church, as the Korean Methodist Church has been in existence since the arrival of early missionaries who first came to Korea and also the Korean Presbyterian Church which has been most divided of the different denominations in Korean Church history. It could be helpful to find the new way of mission for unity and forgiveness in Korean church history.