South Korea's main opposition Democratic Party said Monday the refutation filed by President Park Geun-hye to the Constitutional Court on her impeachment showed no sign of self-reflection, adding the letter is only intended to buy time.

In a document released on Sunday, Park said the impeachment motion passed by parliament lacked sufficient legal grounds, adding no serious crime was committed to warrant her being dismissed from office.

Park was impeached on Dec. 9 by the National Assembly on corruption charges centered on her decades-long friendship with Choi Soon-sil. The Constitutional Court is currently reviewing the legitimacy of the motion and has up to 180 days to deliver a ruling. Park was accused of allowing Choi to exert undue influence on state affairs.

The president then said the motion itself violated clear rules that ban "guilt by association" as well as "presumption of innocence," strongly suggesting a media bias and that lawmakers carried out the impeachment without actually checking evidence.

Park, moreover, claimed she was not aware of any wrongdoings committed by those around her, and referred to Choi as a "kitchen cabinet" member or informal adviser, which is commonplace in countries like the United States.

"Any attempt to delay the Constitutional Court's proceedings will not be tolerated," Rep. Choo Mi-ae, head of the Democratic Party said.

Choo said the impeachment was not based on guilt by association, but considered Park an accomplice to her confidante Choi. (Yonhap)