Yoon attended the court hearing on Wednesday on the detention warrant, wearing a dark navy suit and a red tie, but did not answer questions from reporters.
His lawyers have denied the allegations against him and called the detention request an unreasonable move in a hasty investigation.
More than 1,000 supporters rallied near the court on Wednesday, local media reported, waving flags and signs and chanting Yoon’s name in the heat of 35 degrees Celsius.
In their warrant request, prosecutors said Yoon poses a flight risk, local media reported.
