Several blocks away, a smaller cluster of anti-Yoon protesters chanted for the death penalty, the punishment that prosecutors had sought for the ex-president.
One demonstrator, Choi Jaejic, said he had spent nearly every weekend over the past year joining rallies calling for a conviction. “Martial law threw the country into chaos,” said Mr. Choi, a translator. “He took away precious time away from my children.”
“Even the death sentence wouldn’t be enough,” said Kim Mo-geun, a college student in his 20s.
Mr. Yoon himself showed little emotion in court. After his sentence was read aloud, a television camera showed him averting his gaze from the judge.
But his supporters and political adversaries were clearly not satisfied with the verdict.
Mr. Yoon’s lawyers called the sentence political theater, saying in a statement that the judges had ignored the truth and “knelt before the political force that wanted to purge its enemy.” They also vowed to “fight to the end.”