South Korea (officially the Republic of Korea) has undergone six republics and nine constitutional amendments since its independence in 1948. It has adopted the Presidential System and its presidents are the dominant figures in its politics. This paper discusses the constitutional amendments, the elected presidents, current presidential electoral system including how the president is elected and the campaign regulations, the impeachment, removal, vacancy, and succession of the president. The paper also analyzes the presidential campaigns since South Korea's democratization in 1987 and the special characteristics of its presidency. This paper finds: South Korea has been ruled by strongmen and minority presidents; ex-presidents all ended up in tragedy; and its politics is filled with strong personalities and localism, coupled with deep social schisms. All these mean that South Korea's democratization is still developing. There is little that Taiwan can emulate from South Korea's presidential elections except its strict campaign regulations.