After surviving one impeachment attempt, South Korean President Yoon Suk Yeol's finally luck ran out when parliament voted to suspend his powers.

South Korean lawmakers are set to vote for a second time Saturday on whether to impeach President Yoon Suk Yeol over his failed attempt to impose martial law.

South Korean President Yoon Suk Yeol's switch from contrition to defiance on Thursday over his martial law order rallied some supporters but other members of his party said it did nothing to sway their view that he must be removed from office.

Prosecutors have also accused Kim Yong Hyun, ousted defence minister, of advising the president to deploy troops to block parliamentary votes on the decree. Mr Kim, currently in custody, reportedly attempted to take his own life but was stabilised after intervention by detention centre officials.

The Constitutional Court now has up to 180 days to determine whether to dismiss Yoon Suk Yeol as president or restore his powers.

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The South Korean National Assembly voted on December 14 to impeach President Yoon Suk Yeol after his attempt to impose martial law earlier this month. Several thousand Koreans cheered at a rally just outside the National Assembly.

The Constitutional Court will decide whether to remove Yoon sometime in the next six months. If he is removed from office, a snap election will be called.

Yoon must immediately hand over power to the prime minister, who will act as caretaker while the courts review the impeachment vote. The process could take months.