Acting President Choi Sang-mok on Tuesday issued a New Year's message, sharing his vision of overcoming the current crisis wisely as the country faces grave sadness for the loss of 179 lives in a Jeju Air's plane crash and presidential impeachment.

South Korea's acting President Choi Sang-mok said on Tuesday he would immediately move to fill vacancies on the Constitutional Court in a effort to restore stability after the impeachment of two of his predecessors this month triggered political turmoil.

Finance Minister Choi Sang-mok became on Friday South Korea's second acting president in two weeks, as lawmakers voted to impeach the current acting leader, Prime Minister Han Duck-soo, fuelling political uncertainty in Asia's fourth-largest economy.

The presidential office voiced regret Tuesday after acting President Choi Sang-mok appointed two justices to the Constitutional Court, saying he has gone beyond his authority as the interim leader by going ahead with the appointments.

Republic of Korea is in an unprecedentedly serious situation, Choi said in a written statement, citing changes around global trade, diplomacy and security, as well as domestic political uncertainty

Acting president Choi Sang-mok appointed one liberal and one conservative judge to the Constitutional Court as the National Assembly wrapped up its final plenary session with a slew of DP-railroaded bills.