It is being reported that President Moon’s trial balloon specialist, Moon Chung-in who has spoke about ending the US-ROK alliance and has advocated for helping North Korea evade sanctions may be picked to be the next ambassador to the United States:

Conservatives squawked Thursday about the possibility that President Moon Jae-in will send special adviser Moon Chung-in to Washington as Korea’s ambassador.
“How can you possibly send a destroyer of the Korea-U.S. alliance to be ambassador to the United States?” Chairman Hwang Kyo-ahn of the Liberty Korea Party (LKP) said Thursday during a meeting of the party leadership.
Hwang was reacting to media reports saying that the president’s special adviser for foreign affairs and national security would be named to replace current U.S. Ambassador Cho Yoon-je.
“This is the worst example of the president’s arrogance and high-handedness,” Hwang said. “[Moon Chung-in] even argued that the Korea-U.S. alliance must end. What will he do if he is appointed ambassador? We can never agree to such an appointment. The people won’t accept it either.”
Joong Ang Ilbo
You can read more at the link, but the best to think of Moon Chung-in is as the anti-John Bolton of South Korea.