Military rule in South Korea is surprising but nothing new

It came as a shock both domestically and abroad when Yoon Suk Yeol, the president of South Korea, declared martial law on Dec 3.
But the country has a history of martial law and military rule. In this case, the effort to suspend civilian government proved short-lived. After South Korea’s parliament voted to demand the lifting of martial law, Yoon said he would comply just hours after making his initial announcement.
Here’s a quick primer on the history. 
Martial law was last introduced on Oct 27, 1979 by Prime Minister Choi Kyu-hah following the assassination of President Park Chung-hee, who had seized power in a military coup in 1961.
Under pressure from a group of military leaders led by General Chun Doo-hwan, Choi, by now the president, extended martial law into 1980 and banned political parties, sparking a backlash by pro-democracy forces. Hundreds of people died in a deadly crackdown before martial law was lifted in 1981 following a referendum.
Political parties were again permitted to function and in 1987 other civil rights were restored, producing a period of democracy that had prevailed up until the current president made his martial law declaration in an emergency national address televised live.
The first declaration of martial law was in 1948, just months after South Korea’s formal establishment, by its first president, Syngman Rhee, who was working with US forces to suppress a communist-led military rebellion. He imposed it again in 1952, during the Korean War.
Martial law was deployed on a number of occasions by various regimes over the intervening years as the nation went through a turbulent period marked by military coups.
The president has the authority to declare martial law under the constitution in circumstances of war, armed conflict or other national emergencies.
South Korea has two types of martial law: Emergency martial law and security martial law. The former, invoked by President Yoon, grants the government sweeping powers, restricting the freedom of the press, limiting assembly and overriding civil courts, among other things.
The president must notify the National Assembly after declaring martial law.
If the assembly demands its termination by a majority vote, as it did in the most recent case, the president must comply.