Korea's Political System Decoded: How It Works, How Power Is Checked, and What Foreign Residents Can Actually Vote On

Korea held nationwide local elections on June 3, 2026. If you have been living in Korea for a while and still feel like the political system moves faster than you can follow it, you are not alone. This guide lays out the structure: how power is divided, what stops the president from going rogue, and whether you personally can vote in local elections.

What Kind of Democracy Is Korea?

Korea is a presidential republic. It is a unitary state with a multi-party system, currently in its 6th Republic (제6공화국). The 6th Republic began when the current constitution took effect on February 25, 1988.

The simplest comparison: Korea's system is closer to the United States than to the United Kingdom. The president runs the executive branch. The National Assembly (국회) writes the laws. The courts check both. There is no monarch, no prime minister who is the actual head of government, no parliamentary confidence votes that can remove the executive.

Article 1 of the constitution sets the frame: the Republic of Korea is a democratic republic, sovereignty rests with the people, and all state authority emanates from the people. The voting age is 18.

The Three Branches

The Executive

The President holds the top executive office. The term is 5 years, and it is a single non-renewable term under article 70. There are no exceptions and no mechanism to extend it. A former president cannot return to office, ever.

This design was intentional. Korea spent much of the 1960s through the 1980s under leaders who amended constitutions to stay in power. The single 5-year term was a direct response. More on that in the history section below.

The Prime Minister (국무총리) is appointed by the president and requires National Assembly consent under article 86. The role is best understood as senior administrator and chief coordinator of ministries, not a co-equal head of government. The president sets policy; the prime minister coordinates its execution.

The Cabinet (국무회의) is the deliberative body of the executive, made up of the president, the prime minister, and the heads of each ministry. It operates under article 88. It deliberates on major policy; it does not hold sovereign authority.

The Legislative Branch

The National Assembly (국회) is unicameral: one chamber, 300 seats. Members serve 4-year terms. Articles 41 and 42 of the constitution set these basics.

Of the 300 seats, 254 are constituency seats (one member per district) and 46 are proportional representation seats allocated by party vote share. The current term is the 22nd National Assembly, elected on April 10, 2024. The next election is in 2028.

The Assembly passes laws, approves the national budget, ratifies treaties, and holds the power to impeach the president and other senior officials.

The Judicial Branch

Korea has two separate high courts, and the distinction matters.

The Supreme Court (대법원) is the top court for ordinary civil, criminal, and administrative cases. Cases move up through district courts and appellate courts and can reach the Supreme Court. The Chief Justice and other justices are appointed by the president with National Assembly consent, serve 6-year non-renewable terms, and retire at 70.

The Constitutional Court (헌법재판소) is a separate body entirely. It was created by the 1987 constitution, and its separation from the Supreme Court was deliberate: the founders wanted constitutional review kept away from the ordinary judiciary so no single branch could capture it.

The Constitutional Court has 9 justices. Three are appointed directly by the president. Three are elected by the National Assembly. Three are nominated by the Chief Justice of the Supreme Court. All serve 6-year terms (renewable) and retire at 70.

The Constitutional Court handles five types of cases: (1) judicial review to determine whether a law is constitutional, (2) impeachment trials, (3) dissolving political parties, (4) disputes between constitutional bodies, and (5) constitutional complaints from citizens. When you hear about impeachment reaching "the Constitutional Court," this is the body that holds the trial and delivers the final verdict.

The Election Calendar and What Foreign Residents Can Vote On

Presidential elections take place every 5 years. Voters choose directly by plurality: the candidate with the most votes wins, in a single round. There is no runoff. The most recent presidential election was the snap election on June 3, 2025, triggered by Yoon Suk-yeol's removal from office. Before that: March 9, 2022 (Yoon won) and May 9, 2017 (another snap, after Park Geun-hye was removed).

National Assembly elections take place every 4 years. The most recent was April 10, 2024, which produced the current 22nd Assembly.

Local elections (전국동시지방선거, nationwide simultaneous local elections) are held every 4 years on the first Wednesday of June. June 3, 2026 was the 9th nationwide local election. Voters across the country chose provincial and metropolitan governors (광역단체장), city/county/district heads (기초단체장), provincial and metropolitan council members (광역의회 의원), city/county/district council members (기초의회 의원), and superintendents of education (교육감).

Who could vote in 2026? The final 2026 local-election voter roll included 44,649,908 voters in total: 44,409,225 Korean nationals resident in Korea, 89,151 resident overseas Koreans, and 151,532 foreign voters.

To be eligible, you must hold F-5 permanent resident status (영주의 체류자격), have held F-5 status for at least 3 years from the grant date, be aged 18 or older, and be registered in the local foreign resident registry. More detail on eligibility is in the voting section below.

Checks and Balances: What Stops a President Going Rogue

The 1987 constitution built several hard stops into the system. All of them have now been tested.

Presidential Veto

Under article 53, the president has 15 days to return a bill to the National Assembly with written objections. The Assembly can override the veto, but the threshold is high: a majority of members present must vote to override, and that number must represent at least 2/3 of members present. There is no line-item veto. The president must accept or reject a bill in full.

Assembly Impeachment

Under article 65, the National Assembly can vote to impeach the president, the prime minister, cabinet members, judges, and other senior officials. For the president specifically: a majority of all 300 members must propose it, and 2/3 of all 300 members (200 votes or more) must pass it. The moment the Assembly passes an impeachment motion, the president's powers are suspended immediately. The acting president role passes to the prime minister.

Constitutional Court Trial

After the Assembly votes to impeach, the case goes to the Constitutional Court for trial. At least 6 of the 9 justices must vote to uphold the impeachment for the president to be permanently removed (article 113). If the court rejects the impeachment, the president is restored. If the court upholds it, the president is removed from office and barred from holding public office for 5 years.

Martial Law Override

Article 77 gives the president the power to declare martial law (계엄령) in a military emergency, but with an immediate check: the president must notify the National Assembly, and if the Assembly demands the lifting of martial law by a majority vote, the president must comply. This provision activated in December 2024 and worked exactly as designed.

Three Times Korea Has Impeached Its President

The Roh case shows the check working in both directions. The Assembly impeached him on March 12, 2004, with 193 of 195 voting members in favor. The Constitutional Court reviewed the case and rejected it on May 14, 2004. Roh returned to office after 63 days of suspension.

Park Geun-hye's case took longer. The Assembly impeached her on December 9, 2016, with 234 votes in favor, including members of her own party. Her powers were suspended. The Constitutional Court upheld the impeachment 8-0 (with one seat vacant) on March 10, 2017. She was removed.

Yoon Suk-yeol's case moved faster. He declared martial law at 10:27pm on December 3, 2024. National Assembly members rushed to the chamber overnight. At 1:01am on December 4, with 190 members present, all 190 voted to demand the lifting of martial law. Yoon lifted it. The Assembly then voted to impeach him on December 14, 2024, with 204 in favor, 85 opposed, 3 abstentions, and 8 invalid votes. The Constitutional Court upheld the impeachment 8-0 (one seat vacant) on April 4, 2025, at 11:22am KST. The court found the martial law declaration to be unconstitutional. Yoon was removed.

The pattern across all three cases is that the constitutional mechanism functioned as designed. When the Assembly voted to reject Roh, the court said no. When it voted to remove Park and Yoon, the court agreed. The system was built to handle exactly these situations.

Major Parties (Current as of June 2026)

Korea has a multi-party system. The two largest parties are:

People Power Party (국민의힘): Center-right. The party was renamed from the United Future Party on September 2, 2020, continuing a lineage that runs through Saenuri Party (새누리당, 2012-17), Liberty Korea Party (자유한국당, 2017-20), and United Future Party (2020). The PPP is currently the largest opposition party.

Democratic Party of Korea (더불어민주당): Center-left. Renamed from the New Politics Alliance for Democracy on December 28, 2015. As of June 2026, the Democratic Party holds the presidency under Lee Jae-myung and is the largest party in the 22nd Assembly.

Smaller parties with seats in the 22nd Assembly:

• Rebuilding Korea Party (조국혁신당)
• Reform Party (개혁신당)
• Progressive Party (진보당)

Seat totals shift as by-elections, party switches, and vacancies occur. For the live count, the National Assembly's website (assembly.go.kr) maintains the current party and negotiation-group tally.

Can I Vote, and How Do I Check?

Korean citizen, aged 18 or older: You can vote in presidential, National Assembly, and local elections.

F-5 permanent resident holder, 3 or more years since your F-5 grant date, aged 18 or older, registered in the local foreign resident registry: You can vote in local elections only. Not presidential elections and not National Assembly elections.

All other visa holders (E-2, D-2, F-4, F-6, H-1, H-2, and all others): You cannot vote in Korean elections unless you later become a Korean citizen or meet the F-5 local-election rule above.

The 3-year clock is important to get right. It starts from the date Korea granted you F-5 status, not from your initial arrival in Korea. If you got F-5 status two years ago after living here for eight years, you are not yet eligible. The legal basis is article 15, paragraph 2, item 3 of the Public Official Election Act (공직선거법 제15조 제2항 제3호).

To check your personal eligibility for an upcoming election, use the National Election Commission (중앙선거관리위원회) and local-government voter-roll notices before that election.

Why the System Looks the Way It Does

Everything that looks unusual about Korea's constitution, including the single 5-year term, the separate Constitutional Court, the explicit martial law override, comes from the same source: the June Democracy Movement (6월 항쟁) of 1987.

Korea spent 1961 to 1979 under Park Chung-hee. He took power in a military coup, then used the 1972 Yushin Constitution (유신헌법) to eliminate direct presidential elections and remove term limits entirely. This let him rule indefinitely. After Park's assassination in 1979, Chun Doo-hwan took power in another coup. The 1980 constitution introduced a 7-year single term, but the election was still indirect.

By 1987, mass protests were demanding a return to direct presidential elections. The government conceded. The constitutional revision that followed was designed with specific safeguards against a repeat of the Park and Chun era:

Single 5-year term: Prevents a president from accumulating power over time or using incumbency to stay. The goal was to prevent 장기집권, prolonged one-man rule.

Separate Constitutional Court: The ordinary judiciary had been compliant with executive power. A separate court with appointment slots spread across all three branches, with a supermajority threshold for removing a president, was designed to be harder to capture.

Martial law override: The Yushin-era constitution did not give the legislature the power to lift martial law. The 1987 constitution added it explicitly.

This is why observers often note that "the system worked" in 2017 and 2025. It did not work by accident. It was specifically engineered to handle exactly those scenarios.

FAQ

Can I vote in Korean local elections?

Only if you hold F-5 permanent resident status, have held it for at least 3 years from the grant date, and are 18 or older. F-5 holders who meet all three conditions can vote in local elections only. Foreign residents on any other visa, including F-4, F-6, E-2, D-2, and H-series visas, cannot vote.

What is the difference between the Supreme Court and the Constitutional Court?

The Supreme Court (대법원) is the top court for civil, criminal, and administrative cases. The Constitutional Court (헌법재판소) is a separate institution that reviews whether laws are constitutional, tries presidential impeachments, and can dissolve political parties. Korea created the Constitutional Court in 1987 specifically to keep constitutional review independent from the ordinary judiciary. They are not the same institution and do not overlap in jurisdiction.

Why does Korea elect presidents to one 5-year term and never more?

The single non-renewable term was a core demand of the June Democracy Movement of 1987. It was written into the constitution to prevent a repeat of Park Chung-hee's rule, during which the constitution was amended to eliminate term limits and allow indefinite one-man rule. Under article 70, a former Korean president cannot return to office under any circumstances.

What happens if the president vetoes a bill?

Under article 53, the president has 15 days to return a bill to the National Assembly with written objections. The Assembly can override the veto if a majority of members present vote to override and that number equals at least 2/3 of those present. There is no line-item veto: the president must accept or reject a bill in full.

How did the National Assembly stop martial law in December 2024?

President Yoon declared martial law at 10:27pm on December 3, 2024. Article 77 of the constitution requires the president to notify the Assembly immediately and obliges him to lift martial law if the Assembly demands it by majority vote. At 1:01am on December 4, 190 members present voted unanimously to demand the lifting. Yoon lifted it. The Assembly then voted to impeach him on December 14, 2024. The Constitutional Court upheld the impeachment 8-0 on April 4, 2025.

Who is the current president of Korea?

Lee Jae-myung (이재명) of the Democratic Party is Korea's 21st president. He won the snap presidential election on June 3, 2025, with 49.42% of the vote and a turnout of about 79.4%. He took office on June 4, 2025. His term runs to June 3, 2030.

Why is Korea called the 6th Republic?

Korea numbers its constitutional eras as republics. The 1st Republic was founded in 1948. Each major constitutional rupture that produced a new governmental order started a new numbered republic. The 6th Republic began when the current constitution took effect on February 25, 1988, following the constitutional reforms won by the June Democracy Movement of 1987.

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As of June 2026. Verify current seat tallies at assembly.go.kr and voter eligibility at nec.go.kr.

@misc{seoulstart-korean-political-system-decoded,
  author = {{Seoulstart Editorial Team}},
  title = {{Korea's Political System Decoded: How It Works, How Power Is Checked, and What Foreign Residents Can Actually Vote On}},
  year = {2026},
  publisher = {Seoulstart},
  url = {https://seoulstart.com/guides/korean-political-system-decoded},
  note = {Last updated June 6, 2026}
}