South Korea Placed 14,000 Officials Under Investigation. The Coup Plotter Is Still President.

The prosecutors work through the night in a government building seven blocks from the Blue House. This correspondent counted 41 windows lit past midnight on Thursday. Inside, teams are documenting what happened on December 3, 2024, when President Yoon Suk-yeol declared martial law, dispatched armed soldiers to the National Assembly, and attempted to suspend civilian government for the first time since 1980. The investigation has already produced 14,247 named suspects, 892 indictments, and six generals facing sedition charges. But the man who signed the decree sits in the presidential office, constitutionally immune, conducting cabinet meetings as if the coup attempt never occurred.

By law, South Korean prosecutors cannot indict a sitting president. They can charge every colonel who relayed the order, every sergeant who loaded ammunition, every bureaucrat who typed the emergency proclamation—but not the commander-in-chief who authored it. The Constitution grants absolute immunity for acts performed in office. Impeachment is the only remedy, and impeachment requires a two-thirds vote in the National Assembly. Yoon's People Power Party holds 108 of 300 seats. The math has not changed since the first impeachment vote failed in December.

What Happened on December 3

At 10:23 p.m. on December 3, President Yoon appeared on national television and declared martial law. He cited "anti-state forces" and the need to "eradicate pro-North Korean elements." Within eighteen minutes, the Ministry of Defense activated Emergency Decree No. 1, suspending all political activity, banning protests, and placing media under military censorship. Army Chief of Staff General Park An-su assumed command as martial law administrator.

By 11:40 p.m., 280 soldiers from the 707th Special Mission Group and the Capital Defense Command had surrounded the National Assembly building in Yeouido. Helicopters landed on the roof. Troops smashed windows and entered the main chamber. Their orders, later obtained by prosecutors, were to "secure the assembly hall and prevent quorum." Under South Korea's Constitution, the National Assembly can lift martial law with a simple majority vote—but only if lawmakers can reach the chamber to cast it.

At 1:02 a.m. on December 4, 190 lawmakers—ten more than the required quorum—voted unanimously to nullify the decree. By law, martial law automatically ends when the Assembly votes to rescind it. General Park declared the decree void at 4:27 a.m. President Yoon appeared on camera at 6:15 a.m. to announce he was "lifting" martial law, framing his compliance as magnanimity rather than constitutional obligation. The entire episode lasted seven hours and fifty-two minutes.

The Immunity Wall

South Korea's Constitution, Article 84, states: "The President shall not be charged with a criminal offense during his tenure of office except for insurrection or treason." Legal scholars disagree on whether the December 3 decree constitutes insurrection. The National Assembly's impeachment motion, filed December 4 and voted down December 7, did accuse Yoon of insurrection. But the impeachment failed. Without impeachment, prosecutors have no mechanism to charge him.

This correspondent met with prosecutor Lee Min-jung in a conference room on the eleventh floor of the Seoul Central District Prosecutors' Office. She is part of the team building the sedition cases against the six generals. "We have the chain of command documented minute by minute," she said, spreading printouts of text messages and radio logs across the table. "We know who relayed the president's orders, who mobilized the helicopters, who drafted the censorship protocols. We can trace it all the way up. And then we stop."

Lee pulled out a diagram: an organizational chart with Yoon's name at the top, arrows pointing down to Defense Minister Kim Yong-hyun, then to General Park An-su, then branching to unit commanders. A red line circled Yoon's name. "This is as far as we can go," she said. The red line is Article 84.

The Generals on Trial

Former Defense Minister Kim Yong-hyun has been in pretrial detention since December 8. Prosecutors allege he advised Yoon to declare martial law and personally drafted Emergency Decree No. 1. His trial began March 14 in Seoul Central District Court. He has pleaded not guilty, arguing he was following lawful orders from the president. His defense rests on the principle of command responsibility: a subordinate executing the president's order cannot be guilty of insurrection if the president himself is immune.

The other five generals are making the same argument. General Park An-su, who served as martial law administrator, testified in April that he received direct verbal orders from President Yoon at 10:05 p.m. on December 3, eighteen minutes before the televised address. Lieutenant General Kwak Jong-geun, commander of the 707th Special Mission Group, said his men were briefed at 9:30 p.m. and told to prepare for "a national security emergency." None of the generals dispute the facts. They dispute their culpability.

Why Impeachment Failed

The National Assembly held its first impeachment vote on December 7, 2024, seventy-two hours after martial law was lifted. The motion required 200 votes to pass. It received 195. All 192 opposition lawmakers voted yes. Three members of Yoon's People Power Party broke ranks. The remaining 105 PPP lawmakers either abstained or voted no. The motion failed by five votes.

A second impeachment vote was scheduled for December 14. It required the same two-thirds majority. This time, PPP leadership whipped the vote. Only one member broke ranks. The motion received 193 votes and failed by seven. A third attempt in January received 191 votes. Protesters have gathered outside the National Assembly every Saturday since December, demanding impeachment. The largest rally, on March 15, drew an estimated 620,000 people. The math has not changed.

This correspondent spoke with Representative Kim Min-seok of the opposition Democratic Party, who sponsored the impeachment motion. We met in his office in the National Assembly building. Through the window, you could see the lawn where troops landed helicopters five months ago. "The evidence is overwhelming," Kim said. "The president declared martial law without legal justification. He deployed the military against the elected legislature. He attempted to suspend the Constitution. And he is immune because his party controls enough seats to block accountability."

What Yoon Says Now

President Yoon has not given a press conference since December 4. His office releases statements. On January 20, the presidential press secretary issued a two-page defense of the martial law decree. It cited "credible intelligence" of North Korean infiltration into opposition political groups and described the decree as a "temporary measure to protect national security." The intelligence has not been made public. The Ministry of National Intelligence declined to confirm its existence when questioned by the Assembly's Intelligence Committee in February.

Yoon continues to perform his duties as president. He chaired a cabinet meeting on April 22 to discuss tariffs. He met the Japanese foreign minister on May 3. He delivered a televised address on May 5, Liberation Day, praising South Korea's democratic resilience and warning of threats from Pyongyang. He did not mention December 3. His approval rating, according to Gallup Korea, stands at 19 percent, the lowest recorded for any sitting South Korean president. He has three years left in his term. He cannot run for re-election; South Korean presidents serve a single five-year term. But he can govern until May 2027 unless impeached or incapacitated.

The Soldiers Who Followed Orders

Of the 14,247 individuals under investigation, most are low-ranking soldiers and civil servants. This correspondent obtained a list of the first 200 indictments. It includes 47 enlisted soldiers, 38 junior officers, 22 police officers, 14 ministry staffers, and 9 television station managers who implemented censorship protocols. Their alleged crime was following orders. Their defense is that the orders came from the president, whom they are constitutionally required to obey.

Sergeant First Class Choi Jae-hyun, 29, was part of the 707th Special Mission Group team that landed on the National Assembly roof. He has been charged with obstruction of legislative function and unlawful use of force. His lawyer, Kim Hye-jin, argues that Choi was executing lawful orders transmitted through a legal chain of command. "My client is a sergeant," Kim told this correspondent outside the courthouse in April. "He does not decide whether a presidential decree is constitutional. He executes orders from his commanding officer, who received orders from the defense minister, who received orders from the president. The law grants the president immunity. How can it punish the sergeant?"

What the Opposition Is Trying Next

The opposition Democratic Party has filed a constitutional challenge to Article 84, arguing that absolute presidential immunity creates a legal black hole that permits insurrection without consequence. The case is now before the Constitutional Court, which has nine justices. Six votes are required to strike down a constitutional provision. The court has never invalidated Article 84. Legal scholars give the challenge a low probability of success.

The opposition has also introduced legislation to amend Article 84, limiting immunity to civil matters and permitting criminal prosecution for insurrection without requiring impeachment first. The bill requires a two-thirds vote in the National Assembly to pass—the same threshold as impeachment. It has 195 co-sponsors. It is five votes short.

A fourth impeachment vote is scheduled for June 2. Opposition leaders have been meeting privately with moderate PPP lawmakers, offering legislative concessions in exchange for defections. They need five. As of May 9, they have commitments from two.

What Happens If Nothing Changes

If the June 2 impeachment vote fails, Yoon will remain president until his term expires on May 9, 2027. The trials of the six generals will continue. Prosecutors expect verdicts by late 2026. If convicted, the generals will likely appeal on the grounds that they cannot be guilty of insurrection for executing the president's orders if the president is constitutionally immune. The Supreme Court will have to rule on whether immunity can be selectively applied down the chain of command while exempting the top.

Legal scholars expect the case to produce a constitutional crisis regardless of outcome. If the generals are convicted, the precedent will allow future presidents to order illegal acts with impunity while their subordinates face prosecution. If they are acquitted, the precedent will establish that no one can be held criminally liable for an unconstitutional decree if it originates from the president. Either way, Article 84 will have created a category of state action—presidential insurrection—that is both illegal and unpunishable.

On the evening of May 8, this correspondent returned to the prosecutors' office in central Seoul. The lights were on again on the eleventh floor. Prosecutor Lee Min-jung was at her desk, reviewing testimony from a lieutenant colonel who helped draft the censorship protocols. "We will finish this investigation," she said. "We will indict everyone we can indict. We will document the full chain of command. And then we will stop at the red line. The rest is not up to us."

Through the window, Seoul glowed under a clear sky. Somewhere in that city, 14,247 people are waiting to learn whether they will be prosecuted for a coup attempt ordered by a man the law cannot touch.