atic ▁republic , ▁where by ▁the ▁President ▁is ▁the ▁head ▁of ▁state , ▁and ▁of ▁a ▁multi - party ▁system . ▁The ▁government ▁exer cis es ▁Executive ▁power ▁and ▁Legisl ative ▁power ▁is ▁v ested ▁in ▁both ▁the ▁government ▁and ▁the ▁National ▁Assembly . ▁The ▁Jud ici ary ▁is ▁independent ▁of ▁the ▁executive ▁and ▁the ▁legisl ature ▁and ▁compr ises ▁a ▁Supreme ▁Court , ▁app ell ate ▁courts ▁and ▁a ▁Constitution al ▁Court . ▁Since ▁ 1 9 4 8 , ▁the ▁constitution ▁has ▁under g one ▁five ▁major ▁revis ions , ▁each ▁sign ifying ▁a ▁new ▁republic . ▁The ▁current ▁Six th ▁Republic ▁began ▁with ▁the ▁last ▁major ▁constitution al ▁revision ▁in ▁ 1 9 8 7 . ▁ ▁The ▁Econom ist ▁Int elligence ▁Unit ▁r ated ▁South ▁Korea ▁with ▁a ▁score ▁of ▁ 8 / 1 0 , ▁making ▁it ▁the ▁ 2 3 rd ▁most ▁dem ocr atic ▁country ▁in ▁ 2 0 1 9 ▁ ▁National ▁government ▁ ▁Executive ▁branch ▁ ▁| Pres ident ▁| M oon ▁J ae - in ▁| D em ocr atic ▁Party ▁of ▁Korea ▁| 1 0 ▁May ▁ 2 0 1 7 ▁| - ▁| Pr ime ▁Minister ▁| Ch ung ▁S ye - ky un ▁| D em ocr atic ▁Party ▁of ▁Korea ▁| 1 4 ▁January ▁ 2 0 2 0 ▁| } ▁ ▁The ▁head ▁of ▁state ▁is ▁the ▁president , ▁who ▁is ▁elected ▁by ▁direct ▁popular ▁vote ▁for ▁a ▁single ▁five - year ▁term . ▁The ▁president ▁is ▁Commander