Before democratization in 1987, South Korea traditionally maintained a term
Sambuyoin () which depicts the
Speaker of the National Assembly, the
Chief Justice of the Supreme Court and the
Prime Minister, as symbol for tripartite
separation of powers. This term was usually used when the
President of the Republic of Korea invites
Sambu-Yoin to important national ceremonies, regarding the
President of the Republic of Korea as a somewhat higher office distinguished from each three branches of the government, which is represented by the
Sambu-Yoin. After democratization, South Korea established the
Constitutional Court of Korea as
constitutional court independent from the old
Supreme Court. Yet the exact position of the
President of the Constitutional Court inside the order of precedence among
Sambu-Yoin remained as potential question. Some of writers tried to call chiefs of highest
constitutional institutions other than the
President of the Republic of Korea, including the Constitutional Court and the National Election Committee (NEC), as
Sabuyoin () or
Obuyoin (), as regarding the Constitutional Court as fourth branch and the National Election Committee as fifth branch of the government, even though South Korea had never regarded the Constitutional Court and the National Election Committee as separated branch of government. This continued disorder got escalated when the EOP tried to demote protocol rank of the
President of the Constitutional Court under the
Prime Minister, when the Constitutional Court made several decisions nullifying policies of the
national President around 2004-2006. The
President of the Constitutional Court boycotted some of national ceremonies to oppose such demotion, and the EOP had no choice but to restore the rank of the constitutional court President over the Prime Minister. So in 2006, EOP declared that 5 chiefs of highest
constitutional institutions other than the
national President as following order: the
Speaker comes first as leader of legislature, and both of the
supreme court Chief and the
constitutional court President comes second as co-leader of judiciary. Following rank was given to the
Prime Minister as deputy leader of executive branch, and the Chair of NEC got the bottom rank as head of constitutionally independent agency. An also at the same time, EOP declared that
Sabuyoin or
Obuyoin is not a legally correct term, since South Korea is a country with a
tripartite system of power separation by the
Constitution, not a
Five-Power Constitution as Taiwan. The EOP suggested using term '
Sambuyoin plus the head of constitutional institution' (). == Current office holders of highest constitutional institutions ==