His lawyers said in a statement Yoon would respond to the investigation on Saturday and tell the truth. They described the investigation as "politically motivated" and "full of falsehood and distortion".
Yoon did not answer questions from reporters as he entered the special prosecutor's office, Reuters news agency reported.
The martial law attempt in December shocked a country that had prided itself on becoming a thriving democracy, having overcome military dictatorship in the 1980s.
Yoon was later oustered in April by the Constitutional Court that upheld his impeachment by parliament.
The special prosecutor sought a warrant to arrest Yoon for refusing to answer repeated summons earlier, but it was rejected by a court this week on grounds that he has since expressed willingness to cooperate
The special prosecutor was appointed in early June and has launched a team of more than 200 prosecutors and investigators to take over ongoing investigations of Yoon, a former top prosecutor who was elected president in 2022.
Yoon is already on trial for leading the December 3 martial law declaration. He had been arrested in January after resisting authorities armed with a court warrant trying to take him into custody, but was released after 52 days on legal technicalities
MA/PR
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