On 14 December 2024, Yoon Suk Yeol, then president of South Korea, was impeached by the National Assembly following the passage of an impeachment bill with 204 of the 300 members voting in favor. This action came in response to Yoon's declaration of martial law on 3 December 2024.
Prime Minister Han Duck-soo assumed the role of acting president pending the Constitutional Court's decision on whether to accept the impeachment. Han was himself impeached on 27 December 2024, and first deputy prime minister Choi Sang-mok became acting president. On 24 March 2025, Han was acquitted by the Constitutional Court and returned to the role of acting president.
The court upheld the impeachment of Yoon in a unanimous 8–0 decision on 4 April 2025, removing Yoon from office. Thus, Han continued as acting president until resigning, along with Choi, on 1 May 2025, which left second deputy prime minister Lee Ju-ho as acting president. The court determined that Yoon's five major illegal acts, including ordering the military and police to block lawmakers from entering the National Assembly, ordering the arrest of judges and Supreme Court justices, and illegally declaring martial law, were serious violations of the Constitution. Per the Constitution, a snap election was held on 3 June 2025, 60 days after Yoon's removal, with Lee Jae Myung being elected to succeed Yoon as president.
An earlier impeachment motion was put to a parliamentary vote on 7 December 2024, but failed because the number of attending legislators did not meet the quorum required for its passage, as members of the ruling People Power Party boycotted the vote.
Opinion polling on the Yoon Suk Yeol presidency throughout 2024 was increasingly negative. The declaration of martial law hardened these views, with many surveyed in South Korea believing Yoon should resign voluntarily, or that he should be formally removed from office.
South Korea has been governed as a presidential democracy under the 1987 constitution, which provides for a strong independent executive. As a result, presidents can only be removed by a difficult impeachment process, rather than a simple vote of no confidence. Only one Korean president, Park Geun-hye, had previously been removed from office through impeachment, which occurred in 2017, also with a unanimous 8–0 decision of the Constitutional Court. Before being impeached himself, Yoon assisted in the prosecution of Park. Roh Moo-hyun was impeached in 2004 on accusations of illegal electioneering, incompetence, and economic mismanagement. However, the Constitutional Court cleared him of two infractions and deemed the remaining charge not serious enough to warrant removal, allowing him to remain in office.
The procedure for impeachment is set out in the 10th Constitution of South Korea in 1987. Article 65, Clause 1, specifies that the National Assembly may impeach the president, prime minister, or other state officials if they violate the constitution or other laws while performing official duties.
For an impeachment motion against a sitting president to pass, a majority of the National Assembly must propose it, and a two-thirds supermajority – 200 out of 300 members – must vote in favor. Once passed, the individual is immediately suspended from their duties pending a ruling by the Constitutional Court of Korea. The scope of impeachment is limited to removal from public office, with no further penalties imposed through this process.
According to the Constitutional Court Act passed in 1988, the Constitutional Court must render a decision within 180 days after it receives any case for adjudication, including impeachment cases. If the respondent has already left office before the decision, the case is dismissed. Formal removal of the president requires six of the nine justices voting in favor. Due to one vacancy, President Yoon Suk Yeol's removal needed six out of eight judges to vote to remove him from office. Article 23 of the Constitutional Court Act requires at least seven justices for deliberation.
If the National Assembly impeaches the president, the president is immediately suspended from office, with the prime minister assuming the role of acting president. In the event of the president's resignation or removal by the Constitutional Court, an early presidential election is required to be held within 60 days. During this interim period, the prime minister continues to serve as acting president until the election of a new president.
Previous calls to impeach Yoon
In July 2024, an online petition started on the National Assembly's website calling for Yoon's impeachment gathered over a million signatures, with all petitions with over 50,000 signatures required under law to be reviewed by a parliamentary committee. The website crashed, with over 22,000 people concurrently waiting to access the website with an estimated wait time of 30 minutes. In November 2024, over 3,000 professors and researchers at various universities signed a letter asking Yoon to resign. One interviewer speculated that the letter had received the highest number of signatures from academics since protests during the Park Geun-hye administration. On 28 November, 1,466 South Korean Catholic priests also called for Yoon to be impeached, issuing a statement titled "How could a person be like this" (어째서 사람이 이 모양인가), which claimed that he is a puppet of private interests who has no idea what he does or who he is and who had handed over the authority entrusted to him by the people to his wife.
On 3 December, Yoon declared martial law in South Korea, stating that martial law was necessary to defend the country from anti-state forces. Military and police forces attempted to prevent legislators from entering the National Assembly Proceeding Hall, causing clashes between the security forces, protesters, and legislative aides. All 190 legislators who were present in the chamber unanimously voted to demand the lifting of martial law, forcing Yoon to lift martial law around 04:00 KST on 4 December.
On 4 December, 190 legislators across six opposition parties submitted a motion for impeachment, intending to discuss the bill the following day; the DPK later planned a vote on 7 December. At a meeting with Prime Minister Han Duck-soo and PPP party leader Han Dong-hoon, Yoon said that he would not resign, there was "no wrongdoing" in his declaration, it was a "warning" to the opposition, and it was to prevent the DPK's "reckless impeachment actions". Yoon also defended plans to arrest Han Dong-hoon for going to the National Assembly. On 5 December, the PPP announced they would oppose impeachment, following an emergency meeting the previous evening. However, at an emergency meeting on 6 December, Han Dong-hoon said it was necessary to "promptly suspend [Yoon] from his duties to protect the Republic of Korea", citing Yoon's orders to arrest and detain key politicians during martial law, including Han himself. That same day, Cho Kyoung-tae voiced his support for Yoon's impeachment, becoming the first MP from the PPP to do so.
During an investigation by the National Assembly on 5 December, Army Chief Park An-su said he had been handed the text of the martial law notice only on the night of its declaration and was unaware of soldiers being deployed to the Assembly. Deputy Defense Minister Kim Seon-ho said he had only learned about the declaration on the news and that Kim Yong-hyun ordered soldiers to enter the Assembly and prevent lawmakers from gathering. He also apologized for failing to prevent the troop deployment, saying that he opposed it. Separately, the National Police Agency announced that Yoon was under investigation for insurrection following a complaint from the opposition. Park submitted his resignation to Yoon, which he rejected.
On 6 December, Special Forces Commander Kwak Jong-guen said he had ordered soldiers present at the Assembly on 3 December not to enter the session hall and ruled out the provision of live ammunition and harm against civilians. He also said that he would not follow such orders in the event of martial law being declared again. Later that day, the Defense Ministry suspended Kwak, Yeo In-hyung and Capital Defense Command Commander Lee Jin-woo for their involvement in martial law. They, along with Park An-su, were also subjected to a ban on overseas travel. Hong Jang-won, the deputy director of the NIS, also said that he was ordered by Yoon to arrest politicians during martial law during a series of phone calls. This was denied by Director Cho Tae-yong, who said the NIS has no such powers. The National Archives of Korea issued notices to the Presidential Office, the Defense Ministry and other relevant agencies, to preserve documents, video footage and other records relating to the declaration of martial law amid concerns over their discarding. The Presidential Office said it did not possess the detailed minutes of the cabinet meeting that preceded the declaration.