Protests demanding Yoon step down kicked off around midday outside the National Assembly, which will vote at 4:00 pm (0700 GMT) on an impeachment resolution -- a week after a first attempt to remove Yoon for the martial law debacle failed.
Opposition parties Thursday filed a second motion to impeach Yoon after a previous impeachment attempt failed.
Thousands of South Koreans have taken to the streets of Seoul to demand Yoon's resignation and jailing after his short-lived martial law declaration sent soldiers and helicopters to parliament last week.
Hundreds of thousands of people have rallied in Seoul as lawmakers again try to impeach the president after his failed attempt to impose martial law South Korea’s ruling party has decided to maintain its official position to vote against the impeachment of president Yoon Suk Yeol, local media has reported.