Head of state and government of South Korea
Source (Wikipedia): President of South Korea

The president of the Republic of Korea, also known as the president of Korea, is both the head of state and head of government of the Republic of Korea. The president is elected by citizens of the Republic of Korea and pledges to execute the duties of their office, chief among others “to defend the State, pursue peaceful unification of the homeland.” The president leads the State Council, is the chief of the executive branch of the national government and the commander-in-chief of the Republic of Korea Armed Forces.