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Electoral System and the National Assembly

South Korea’s electoral system is the mechanism by which citizens elect the President and members of the National Assembly (Gukhoe, 국회), the unicameral legislature of the Republic of Korea. Enshrined in the Constitution of the Sixth Republic (1987), the electoral process reflects South Korea’s transition from authoritarian single-party dominance — through successive constitutions under Syngman Rhee, Park Chung-hee, and Chun Doo-hwan — to a competitive multiparty democracy. The National Assembly is the 300-seat legislative body (fixed at 300 members since the 2012 election, up from 299) that passes laws, ratifies budgets, amends the constitution, and conducts impeachment proceedings against the president and other senior officials. Presidential elections, held every five years with no possibility of reelection, stand as the nation’s most visible democratic exercise; National Assembly elections, held every four years, determine the ruling coalition’s legislative power. The system is administered by the National Election Commission (중앙선거관리위원회, NEC), a constitutionally independent body established under Article 114 that oversees voter registration, campaign finance regulation, vote counting, and election dispute resolution.

Electoral System Overview

The President is elected by direct popular vote, with a simple plurality determining the winner; no runoff is held. This system, known as the “jikseonje” (직선제, direct election), was reinstated in 1987 after decades of indirect or heavily manipulated elections under authoritarian rule. A president serves a single five-year term and is constitutionally barred from reelection or succeeding themselves — a deliberate constraint designed to prevent the concentration of executive power.

The National Assembly consists of 300 members (as of the 2024 election) elected through a hybrid system combining single-member district seats and party-list proportional representation. 254 of the 300 seats are allocated through district voting (지역구, jiyeokgu): voters in each of South Korea’s ~254 electoral districts cast a ballot for a local representative, and the candidate with a plurality wins. The remaining 46 seats are filled through proportional representation (비례대표, biryedaepyo): voters cast a separate “party vote” at the national level, and seats are allocated proportionally to party vote share, with each party filling its allocation from pre-arranged candidate lists. This hybrid mixed-member system — historically majoritarian (parallel), and since 2020 partially “semi-linked” (see below) — attempts to balance local accountability (district seats) with proportionality and fair representation for smaller parties (list seats), though critics argue the small proportional component (about 15% of seats) provides insufficient proportionality.

The minimum voting age is 18 years (lowered from 19 by the Public Official Election Act amendment in December 2019, effective for the April 2020 National Assembly election), and universal suffrage applies to all South Korean citizens. Overseas absentee voting was introduced in 2012, allowing Korean citizens abroad to cast ballots in presidential and National Assembly elections through South Korean diplomatic missions. Voter turnout in presidential elections typically approaches 77–80% (77.1% in 2022; 77.2% in 2017); National Assembly elections typically see 55–67% turnout (66.2% in 2020; 67.0% in 2024 — the highest legislative turnout since 1992, reflecting intense polarization).

National Assembly Structure and Powers

The National Assembly is led by a Speaker (국회의장, gukhoe uijang), elected by its members for a two-year term. The Assembly operates through 17 standing committees covering defense, education, economy, judiciary, culture, and other domains. Legislation requires a simple majority vote; constitutional amendments require a two-thirds supermajority (200 of 300 votes) followed by approval in a national referendum.

The Assembly’s key powers include:

  • Lawmaking — passing all legislation short of constitutional amendments.
  • Budget and taxation — approving the national budget and tax legislation; controlling fiscal policy.
  • Treaty ratification — ratifying international treaties and trade agreements (e.g., the Korea-U.S. Free Trade Agreement).
  • Impeachment — impeaching the president (which requires a two-thirds vote), and the prime minister, ministers, and judges (a simple-majority motion on a one-third proposal), with all impeachments subject to Constitutional Court adjudication.
  • Confirmation — consenting to the appointment of the Prime Minister, the Chief Justice and Supreme Court justices, and the Constitutional Court president, and electing three of the nine Constitutional Court justices; holding confirmation hearings for other senior officials.
  • Investigation and audit — conducting parliamentary investigations and interpellations of government officials, and requesting audits from the Board of Audit and Inspection.
  • War and emergency powers — the Assembly must consent to a declaration of war (Article 60) and can compel the president to lift martial law by a majority vote (Article 77), as it did on December 4, 2024.

Presidential Elections

Presidential elections are held every five years. For most of the post-1987 era they fell in December, with the winner inaugurated the following February 25 (as with Kim Young-sam in 1993 through Park Geun-hye in 2013). The cycle shifted after President Park’s 2017 removal: the snap election that replaced her was held in May 2017, moving the regular schedule to a spring vote with a May 10 inauguration, as in the March 9, 2022 election of Yoon Suk-yeol. Snap elections triggered by a vacancy — such as the June 3, 2025 election following Yoon’s removal — install the winner almost immediately, without a transition period.

Under South Korea’s “winner-take-all” system, a president winning even by a narrow plurality (often 40–45% in a multi-candidate field) commands the full power of the office. This has produced dramatic electoral swings: in 1987, Roh Tae-woo won with 36.6% of the vote split among five major candidates; in 2017, Moon Jae-in won with 41.1%; in 2022, Yoon Suk-yeol won by just 0.73 percentage points (48.6% to Lee Jae-myung’s 47.7%), making it the narrowest margin in modern South Korean history.

Presidential candidates must be nominated by a registered political party. In practice, South Korea’s major parties hold primary elections to select their presidential nominee; these contests have become fierce internal struggles, occasionally spilling into the general election. No sitting or recent ex-president has been able to run due to the single-term limit and constitutional prohibition on consecutive terms.

National Assembly Elections

National Assembly elections are held every four years, usually in April (e.g., April 10, 2024). The electoral-district map (선거구, seongeogu), containing roughly 250 single-member districts, is redrawn by a redistricting commission before each election to account for population shifts. South Korea’s rapid urbanization has meant that rural districts have experienced significant depopulation, leading to debates over malapportionment and fair representation.

In recent decades, South Korea has experimented with changes to the proportional-representation component. Ahead of the 2020 election it adopted a partial semi-linked (준연동형) proportional system, in which a portion of the party-list seats are allocated with a “connected” formula intended to top up parties whose district wins fall short of their party-vote share. The reform backfired in practice: the two largest parties each spun up short-lived satellite parties to harvest list seats, blunting the intended proportionality. In 2024 the split reverted to 254 district and 46 list seats, and both major parties again fielded satellite lists. Proposals to expand and reform proportional representation remain contested.

The party vote — the vote for national-level proportional representation — has become increasingly significant as a signal of the public mood independent of local district races. In 2024, the Democratic Party and its satellite list together won about 175 of the 300 seats, while the ruling People Power Party and its satellite fell to roughly 108 seats and the new Rebuilding Korea Party took 12 list seats; the result reflected public dissatisfaction with President Yoon Suk-yeol’s administration and deepened divided government heading into the 2025 snap presidential election.

Electoral Thresholds and Party Dynamics

The proportional-representation system includes a 3% threshold for national party-list allocation: a party must win at least 3% of the national party vote (or five constituency seats) to qualify for proportional seats. This threshold, designed to reduce legislative fragmentation, has kept many small parties out of the National Assembly, and it is one of the factors that pushed the major parties toward satellite-list strategies to capture seats their smaller allies might otherwise have won. The threshold remains contentious among smaller parties and advocates for greater pluralism.

South Korea’s party system has been marked by intense regionalism, particularly the Honam-TK divide:

  • Honam (North and South Jeolla provinces) has been the traditional stronghold of the Democratic Party (and its precursors), rooted in the 1980 Gwangju Uprising and the political isolation of the region under Park Chung-hee and Chun Doo-hwan.
  • TK (Taegu-Kyeongbuk, the Daegu and North Gyeongsang region) has been the conservative People Power Party’s fortress, boosted by Park Chung-hee’s origins in Gumi and decades of pro-government industrialization.

This regionalism has meant that electoral outcomes in Honam and TK are often predetermined; the election is decided in the swing regions of Seoul, Gyeonggi, and Incheon (the Capital Area), where roughly 50% of the population resides.

Evolution and Constitutional Amendments

The electoral system has undergone dramatic changes reflecting South Korea’s political evolution:

  • 1948–1960: Early Republic under Syngman Rhee. The 1948 presidential election was indirect (chosen by the National Assembly); after the 1952 Pusan Political Crisis, Rhee forced through direct popular presidential elections (1952, 1956, 1960), which grew increasingly manipulated.
  • 1961–1972: Park Chung-hee restored competitive direct presidential elections (1963, 1967, 1971), then abolished them under the Yusin system (1972–1979), in which an electoral college — the National Conference for Unification (통일주체국민회의) — rubber-stamped his reelection.
  • 1980–1987: Chun Doo-hwan seized power through the December 1979 coup and May 1980 crackdown, and was installed as president by indirect electoral-college votes (the National Conference for Unification in 1980, and a new presidential electoral college under the Fifth Republic constitution in 1981).
  • December 1987: Direct presidential elections were restored following the June Democracy Movement (June 1987). General Roh Tae-woo won the first direct presidential election in 16 years.
  • 1992 onward: Continued competitive presidential and National Assembly elections, with transitions of power between opposition parties (1998, 2008, 2017) and ruling parties (2022).

The Constitution has been amended nine times, most consequentially in 1987, when the Sixth Republic Constitution restored direct presidential elections and fixed the single five-year term; it has not been amended since. Later changes to how elections work — such as the two-vote (district plus party-list) ballot introduced for the 2004 election after a 2001 Constitutional Court ruling, and the 2020 semi-linked proportional reform — were made by ordinary statute (the Public Official Election Act) rather than by constitutional amendment. Periodic proposals for deeper reform — expanding proportional representation, allowing a second presidential term, or moving toward a parliamentary system — remain contested and have not reached the amendment threshold.

Special Elections and By-Elections

South Korea has experienced several special presidential elections triggered by constitutional crises:

  • April 1960: Syngman Rhee’s fourth-term victory was annulled after the April Revolution (student-led uprising) forced his resignation; a parliamentary system and new elections followed.
  • December 2016 – March 2017: The National Assembly impeached President Park Geun-hye on December 9, 2016, following mass Candlelight Revolution protests; the Constitutional Court unanimously upheld the impeachment on March 10, 2017. A snap presidential election on May 9, 2017 was won by Moon Jae-in with 41.1% of the vote.
  • December 2024 – June 2025: President Yoon Suk-yeol declared martial law on the evening of December 3, 2024 — the first martial law declaration in South Korea since 1980 — citing alleged anti-state activities by the opposition-controlled National Assembly. The Assembly convened an emergency session the same night, voting 190–0 (with many ruling-party members also supporting the vote) to lift the martial law within approximately six hours of its declaration. The Assembly voted to impeach Yoon on December 14, 2024 with 204 votes (8 ruling-party members joining the opposition), suspending him from presidential duties. The Constitutional Court unanimously upheld the impeachment on April 4, 2025, removing Yoon from office. A snap presidential election on June 3, 2025 was won by Lee Jae-myung of the Democratic Party, ending the People Power Party’s hold on the presidency.

By-elections for vacant National Assembly seats are held in April and October annually, and they serve as bellwethers for national political momentum. Significant by-elections include the April 2021 Seoul and Busan mayoral by-elections, which the PPP and its predecessor won decisively, signaling the shift that produced Yoon Suk-yeol’s 2022 presidential victory.

Electoral Democracy and Its Challenges

Since 1987, South Korea has held competitive, generally accepted presidential and legislative elections, surviving two presidential impeachments (2017 and 2025) — a testament to the resilience of its constitutional institutions. Concerns nonetheless persist:

  • Regionalism — the entrenchment of regional voting blocs limits competition and can exclude entire regions from political influence; the Honam-TK divide remains structurally embedded (see Gwangju).
  • Divided government — the frequent mismatch between presidential and National Assembly majorities (e.g., 2022–2024, and again beginning in 2025), which can paralyze legislation and produce constitutional brinkmanship.
  • Campaign finance — the scale of money in Korean elections and questions of corporate influence, with multiple presidents and their family members convicted of bribery (Park Geun-hye, Lee Myung-bak) following post-tenure prosecutions.
  • Gerrymandering and malapportionment — disputes over electoral district boundaries and their impact on proportionality; rural districts have become severely underpopulated relative to urban ones.
  • Gender representation — women remain underrepresented in the National Assembly; the 22nd Assembly (2024) seated about 60 women (roughly 20%), below the OECD average of around one-third. The party-list proportional seats have been the primary mechanism for increasing female representation, as parties are required to alternate male and female candidates in list placements.
  • Executive over-reach — the 2024 martial law declaration revealed risks in the constitutional system; subsequent proposals to amend the Constitution to reduce the president’s emergency powers and strengthen legislative oversight gained momentum in the post-Yoon political environment.

Women in South Korean Electoral Politics

Women’s political representation has grown significantly since the 1990s but remains below global averages. The number of female National Assembly members rose from just 16 of 273 (5.9%) in the 16th Assembly (2000) to 39 of 299 (13.0%) in the 17th Assembly (2004) — the jump reflecting the introduction of a party-list gender quota — and reached about 60 of 300 (20.0%) in the 22nd Assembly (2024). The proportional-representation lists have been the primary pathway: parties are legally required to place women in every other (odd-numbered) slot on party-list ballots, ensuring women fill at least half of all proportional seats. In district contests, women win significantly fewer races than men, as incumbency advantages and local political networks have historically favored male candidates. Park Geun-hye (PPP, served 2013–2017) remains South Korea’s only female president; her tenure ended with impeachment and criminal conviction for corruption, which some analysts suggest has complicated — rather than advanced — public narratives around female leadership in politics.