President Park Chung-hee was shot and killed during a dinner at a KCIA safe house. His death abruptly ended 18 years of authoritarian rule and created a sudden power vacuum. The event triggered emergency measures and opened a brief period of intensified public demands for political reform.
After Park’s death, students, workers, and opposition voices pushed more openly for ending authoritarian rules and revising the constitution. This period—often called the “Seoul Spring”—reflected rising expectations for political liberalization. The expanding movement also heightened conflict with military leaders who wanted tighter control.
In the hours after the assassination, the government declared martial law across most of the country (with Jeju excluded), placing the military in a central role in maintaining order. This shifted immediate crisis management toward the armed forces and limited political activity. It set conditions in which internal military struggles could shape national politics.
Prime Minister Choi Kyu-hah, who had been acting president after Park’s death, was chosen as president through an indirect vote of the National Conference for Unification (the electoral body under the Yushin Constitution). Although this followed the legal process then in place, Choi lacked an independent power base. The gap between formal authority and real control became a central problem of the crisis.
A military mutiny on December 12, led by Major General Chun Doo-hwan and officers linked to the Hanahoe group, successfully seized control within the armed forces. Key commanders were arrested or sidelined, weakening the existing chain of command. This coup made Chun the dominant power behind the scenes, even though a civilian president formally remained in office.
On May 17, Chun’s group forced the cabinet to extend martial law to the entire country. Universities were closed, political activities were banned, and press restrictions tightened. This ended the “Seoul Spring” opening and marked a decisive turn toward direct military control.
Protests in Gwangju started when students demonstrated against the new martial-law measures and the closure of universities. Military units, including elite paratroopers, confronted demonstrators, and violence escalated as broader sections of the city joined the protests. The uprising became a major national symbol of resistance to military rule.
Kim Jae-gyu, the KCIA director who killed Park, was executed after a rapid trial process. The execution closed the most visible criminal case of the assassination, but it did not resolve the larger struggle over who would lead the country. Political tensions continued as competing groups used security concerns to justify stronger controls.
After days of confrontation, government forces retook key sites in Gwangju and ended the uprising by late May. The crackdown caused significant civilian casualties and deepened distrust of the military government. In the longer term, memories of Gwangju helped unify and strengthen South Korea’s pro-democracy movement.
President Choi Kyu-hah resigned after months in which the military—especially Chun’s faction—held the real levers of power. His departure removed a remaining symbol of civilian leadership during the crisis. The resignation cleared the way for Chun to assume the presidency through the existing indirect election system.
The National Conference for Unification met to choose a president, and Chun Doo-hwan ran as the only candidate. He won by an overwhelming margin in this indirect vote, which the government treated as a formal step to legitimize the new power arrangement. Chun was then inaugurated shortly afterward.
A national referendum approved amendments that reshaped the system under the new military-led government, including an indirect method for choosing the president and a single seven-year presidential term. The vote took place while political activities remained suspended under martial law conditions. The referendum helped institutionalize the transition into a new constitutional order.
The government implemented a major press reorganization that merged or shut down outlets and strengthened state influence over broadcasting and newspapers. Officials presented it as restructuring, but it reduced press independence and narrowed the range of public debate. This reinforced the government’s ability to control political narratives after the 1980 crackdown.
Chun Doo-hwan began a new seven-year term after an indirect election and formal inauguration, marking the start of the Fifth Republic’s constitutional era. This transition signaled that the political crisis that began with Park’s assassination had consolidated into a new, military-backed state structure. Although stability returned at the top, unresolved demands for democracy continued to shape South Korean politics in the years that followed.
Assassination of Park Chung-hee and the 1979–1980 political crisis (1979–1980)