South Korean Prime Minister Han Duck-soo was reinstated in his position

South Korean Prime Minister Han Duck-soo was reinstated in his position on Monday as the constitutional court rejected a motion by the parliament to impeach him.

Despite confirmation that Han's impeachment process was legitimate, the court said neither evidence nor objective materials identified his involvement in impeached President Yoon Suk-yeol's martial law imposition and insurrection.

With the rejection, Han was immediately reinstated as prime minister and acting president as the ruling took effect right after delivering the decision.

"I returned to my duties this morning in accordance with the Constitutional Court's decision. I thank the Constitutional Court for its wise decision," Han Duk-soo said in a statement.

The impeachment motion against Han was passed by the opposition-controlled National Assembly on Dec. 27 last year following the impeachment of Yoon on Dec. 14 over his botched martial law imposition.

Yoon declared an emergency martial law on the night of Dec. 3, but it was revoked by the National Assembly hours later.