Prime Minister Han Duck-soo, left, attends the first hearing of his impeachment trial at the Constitutional Court in Seoul, Feb. 19. Yonhap

The Constitutional Court announced Thursday that it will deliver its impeachment ruling on Prime Minister Han Duck-soo on Monday at 10 a.m.

The ruling will be made 87 days after the National Assembly passed a motion to impeach him on Dec. 27, over his alleged involvement in President Yoon Suk Yeol's Dec. 3 martial law declaration. It also comes 33 days after the trial concluded after only one hearing on Feb. 19.

His verdict will come earlier than Yoon's, as the president was also suspended following a separate Assembly vote on Dec. 14. Following Yoon's suspension, Han filled in as acting president before being suspended himself.

This will mark the first verdict for high-ranking officials impeached or referred to criminal trial following the short-lived martial law decree.

If the court upholds the impeachment motion, he will be removed from office completely, and if it rejects it, he will return to work immediately as acting president as well as prime minister.

The opposition-led Assembly passed the impeachment motion against Han, saying he was culpable as he failed to prevent the president from imposing martial law during a Cabinet meeting held just minutes before the declaration.

The opposition also cited his refusal to appoint Constitutional Court judges as grounds for his impeachment.

Han argues that all grounds for his impeachment presented by the Assembly are invalid, claiming he opposed Yoon's martial law declaration and had no involvement in the mobilization of the martial law troops.

Some legal experts have suggested that there may be a possibility of simultaneous rulings on the impeachments of Yoon and Han, as the treason charges in the president's case overlap with the issues raised in Han's case.

However, the court has decided to rule on Han's case first.

Since both Yoon and Han's impeachment cases center around the legality of the martial law declaration, some believe that the ruling in Han's case could offer insight into the potential outcome of Yoon's case.

Meanwhile, the verdict for Yoon's impeachment case has yet to be scheduled.

The main opposition Democratic Party of Korea (DPK) expressed dissatisfaction over the court's announcement, which it says only heightens public anxiety.

Rep. Jo Seoung-lae, a DPK senior spokesman, questioned in a written statement, "Why is the Constitutional Court, which has always adhered to the principle of handling cases in the order they are received, choosing to rule on Han's impeachment first, despite it being filed later than Yoon's?"

He added that this decision only reinforces the public's suspicions that the court may be swayed by political influences rather than legal principles.