South Korean President Luna Zhe-in will visit the North Korean capital of Pyongyang next month to meet the leader of the North, Kim Jong-un.
For the first time in more than a decade, the South Korean leader visited Pyongyang, and this happens after cultural and sports exchanges.
This year, Mr. Moon has already met with Mr. Kim for the summit meetings.
The adviser said that the South was trying to persuade the North to take concrete steps towards nuclear disarmament.
"Our government is trying to act as an intermediary," said Chung-in Lun, special adviser to President Luna.
Two Koreas have developed their relationship since the new year after Kim promised to suspend nuclear missile tests.
This rapprochement contributed to the beginning of the summit between Mr. Kim and US President Donald Trump in June and an agreement on the denuclearization of the Korean peninsula.
However, there is still a breakthrough in achieving this goal.
The North accused Washington of having made gangster demands for denuclearization and criticized South Korea for taking part in US-led sanctions with "blind obedience."
When will President Luna leave?
No dates were given for the upcoming summit, which was announced after negotiations on the border between the two states.
The main delegate of North Korea, Ri Song-Gwon, told reporters that it would be interesting to keep them in the guesswork.
The two previous summits in April and May took place at the border in Panmundjom.
What is the US doing?
Chun-in Luna said that he believes that US Secretary of State Mike Pompeo will visit Pyongyang next week.
"I think that Pyongyang and Washington will be able to make some kind of compromise," he said.
"And we hope that Secretary Pompeo will be able to work out some kind of compromise with his North Korean counterpart. And we also tell the North Koreans that without taking concrete steps towards denuclearization, it will be very difficult for the United States to accept the North Korean position. "
Earlier this month, in a report prepared on behalf of the UN Security Council, it was established that North Korea had not ceased its nuclear and missile programs, thereby violating the UN sanctions.
He also said that Pyongyang had resorted to a "massive increase" in the illegal transfer of oil products to the ship and ship and was trying to sell weapons abroad.