South Korea's highest court will rule this week on whether impeached President Park Geun-hye should permanently step down over a corruption scandal or be reinstated.
The Constitutional Court said on Wednesday it will issue the ruling on Friday.
If the court formally unseats Ms Park, the country will have to hold a presidential election within 60 days.
South Korea's opposition-controlled parliament voted to impeach Ms Park in December, following weeks of massive protests over suspicions she conspired with a long-time confidante to extort money and favours from companies and allowed the friend to secretly manipulate state affairs.
Ms Park has apologised for putting trust in her jailed friend, Choi Soon-sil, but has denied any legal wrongdoing.