South Korea’s president, Yoon Suk Yeol, announced on Thursday that he had accepted the resignation of his defense minister, the first member of Mr. Yoon’s cabinet to lose his job since the president’s short-lived declaration of martial law on Tuesday night stunned the country.

The defense minister, Kim Yong-hyun, had tendered his resignation on Wednesday, saying that he considered himself responsible for the crisis that the martial law decree had created for Mr. Yoon’s government. He did not directly address allegations among opposition lawmakers and local media that he had suggested the idea to Mr. Yoon.

A statement from the presidential office said that Mr. Kim would be replaced by Choi Byung Hyuk, a retired army general who has been serving as South Korea’s ambassador to Saudi Arabia.

Mr. Yoon withdrew the martial law declaration early Wednesday morning, after the National Assembly voted unanimously against it and protesters gathered to denounce the move. Opposition lawmakers later introduced a motion to impeach Mr. Yoon, which could be voted on as soon as Friday.

If two-thirds of the 300 lawmakers in the National Assembly vote for the motion, Mr. Yoon will be impeached and suspended from office until the country’s Constitutional Court makes a final ruling on whether to reinstate or remove him. All 192 opposition lawmakers support impeachment, but they need at least eight votes from members of Mr. Yoon’s People Power Party to impeach him.

The head of that party, Han Dong-hoon, said on Thursday that he would try to persuade its lawmakers to vote against impeachment, to prevent what he called national “confusion.”

But at the same time, Mr. Han tried to distance the party from Mr. Yoon, calling his martial law decree “unconstitutional” and demanding that he give up his party membership. Mr. Han also said that military leaders who were involved in imposing martial law must be removed from their posts. He did not identify any commanders by name.

“We must show to the military that if they get involved in an unconstitutional and illegal martial law, they will be punished immediately,” Mr. Han said.

Gen. Park An-su, the army chief of staff, led the martial law command during the several hours before the decree was rescinded. Hundreds of troops were sent into the National Assembly in what opposition lawmakers called an “illegal” and “unconstitutional” attempt to stop them from voting against the decree. Staff members barricaded hallways with furniture and used fire extinguishers against troops to keep them from entering the voting chamber.

Mr. Kim, the outgoing defense minister, said the troops had been following his orders when they entered the National Assembly. Mr. Yoon has insisted that martial law was needed to protect the country from disruptive political opposition that had paralyzed his administration.

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