Is the Democratic Party of Korea trying to ”check” the ”Onion Man”? In effect, it ”rejects” the ”Joint Meeting of All Opposition Parties”

Regarding the meeting between South Korean President Yoon Seok-yeol and Democratic Party leader Lee Jae-myung, Cho Kuk, also known as "Onion Man," said,
The Democratic Party essentially rejected the proposal to hold a joint meeting of all opposition parties. A spokesman for the Democratic Party told reporters at the National Assembly on the 24th, "This meeting is between the President and the Democratic Party."
"If the president wants to listen to the voice of the opposition, he should create an opportunity to meet with leaders of other opposition parties, such as the Fatherland Reform Party and the New Reform Party," he said.
On the 22nd, Cho told Lee, "Before I meet with President Yoon, I want you to take the lead in holding a joint meeting of all opposition parties.
If I meet with representatives of all the opposition parties and gather consensus, it will become even more powerful," he said, but this proposal is being interpreted as a de facto "rejection" by the Democratic Party.
It appears that the majority of the Democratic Party is opposed to Chairman Cho's proposal.
A Democratic Party official told South Korean news agency Yonhap News, "All opposition parties
"As a representative, it's unclear how many people one should meet," he said, adding, "It could be that Cho is doing this to increase his own presence."