South Korean President Moon Jae-in has announced his support for amending the South Korean Constitution to allow presidents to serve two four-year terms, instead of the current non-renewable five-year term. Moon, of course, came to office following the impeachment of Park Geun-hye, who became embroiled in a corruption scandal at the end of her non-renewable term: a similar fate befell her predecessor, Lee Myung-bak, who was recently arrested for a wide range of corruption charges.
Presumably, the idea behind this proposal is that it will encourage presidents to improve their behaviour at the end of their terms, given that they will be entitled to seek re-election. The proposal would also mean that members of the National Assembly would serve terms of the same lengths as the President, although elections to the two offices would not become concurrent–indeed, given that Moon’s term expires in 2022, and that the National Assembly’s term expires in 2020, it would shift South Korea to having legislative elections consistently in the middle of presidential terms.
The proposal has a number of other features. The Prime Minister will no longer be expected to act “under order of the President”, the voting age will be lowered from 19 to 18, and the President is no longer able to appoint the head of the Constitutional Court. However, there would appear to be no change in how the Prime Minister is appointed or removed: the Assembly can only pass a motion recommending that the PM or a minister may be removed, which both Samuels and Shugart (2010) and Robert Elgie have interpreted as not being sufficient for semi-presidentialism. The Prime Minister will also remain nominated only by the President (subject to Assembly confirmation).
Passage of the amendments requires approval of two-thirds of the National Assembly and majority support at a referendum with a majority turnout threshold. Moon’s Democratic Party only holds 121 seats in the 300-member assembly, and the opposition right-wing Liberty Korea Party holds 116, giving that party veto power over any potential amendment. That party appears to oppose the amendment proposal, instead apparently supporting a switch to semi-presidentialism, although the Democratic Party could block that. Moon’s proposal has greater public support, although the vast majority of the electorate support at least some change.