The North's official has not been named yet.
North and South Korea have opened a liaison office on the North's side of the heavily militarised border to facilitate better communication and exchanges ahead of their leaders' summit in Pyongyang next week.
The Koreas so far have been using telephone and fax-like communication channels when they want to arrange talks and exchange messages.
Since 2006, the UN Security Council has imposed tougher sanctions against North Korea in response to its repeated nuclear and missile tests.
At an opening ceremony, ROK Minister of Unification Cho Myoung-gyon said the liaison office, which will house resident representatives from Seoul and Pyongyang, would serve as a "cradle for the co-prosperity" of the two Koreas.
"We'll sit face to face, exchange our thoughts fast and accurately and put our heads together to resolve hard matters", he said in remarks distributed by his office.More news: Why Meghan Markle has been going on secret 'incognito' trips to London
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Moon will discuss ways to achieve that goal with Kim, seeking to engineer a proposal that combines a concrete framework for North Korea's denuclearisation and a joint declaration ending the 1950-53 Korean War, Seoul officials said.
The office will be co-headed by Vice South Korean Unification Minister Chun Hae-sung and a deputy head of Ri's committee. This means that for official talks, they have relied upon their respective missions to the United Nations in NY or have held meetings in the truce village of Panmunjom - channels which have proven cumbersome. "So by opening the joint liaison office in Kaesong, hopefully when the nuclear issue comes to an end after this upcoming summit, the Kaesong Industrial Complex could be reopened".
Launched in 2004, the industrial park was hailed as a key symbol of economic cooperation between the Koreas as it combined South Korean capital and technology with cheap labor from the North.
Haley said the panel should release the original report, which cited "a massive increase in illicit ship-to-ship transfers of petroleum products" for North Korea in violation of United Nations sanctions.
Moon, who helped broker the June summit between Kim and US President Donald Trump and has called for a follow-up meeting between the two sides, added South Korea would help mediate contacts between Washington and Pyongyang to "speed up the denuclearization process". He's also dismantled his nuclear and rocket-engine testing sites.
But nuclear diplomacy later became stalemated as United States officials demanded Kim take more significant steps before receiving concessions such as a joint declaration to end the Korean War.
North Korea, meanwhile, did not display intercontinental ballistic missiles that can target the United States at Sunday's military parade, signaling Kim's desire to refrain from provoking Trump to resume talks with Washington.