RoK president Moon Jae-in, right, shakes hands with DPRK leader Kim Jong-un during their meeting at the Peace House at the truce village, April 27, 2018.

Chung Eui-yong, RoK’s President Moon Jae-in's top national security adviser who led the five-member special delegation, told a press briefing that the DPRK leader reconfirmed his firm commitment to the denuclearization of the peninsula during his meeting with the RoK’s special delegation.

Chung and four other delegates met Kim in Pyongyang on Sep[tember 5 during their one-day mission as special envoys, delivering Moon's letter to the DPRK leader.

Chung said the DPRK leader expressed his willingness to closely cooperate with the United States as well as the RoK for the complete denuclearization.

He noted that the two Koreas agreed to hold the third Moon-Kim summit in the DPRK's capital city from September 18-20.

To discuss protocol, security, communications and media coverage for the upcoming summit, the two sides agreed to hold a high-ranking working-level meeting early next week at the border village of Panmunjom.

During the upcoming summit, Moon and Kim would discuss practical measures to denuclearize the Korean Peninsula, as well as issues on the permanent settlement of peace and co-prosperity on the peninsula and the implementation of the Panmunjom Declaration, which the two leaders signed after their April summit.

The two Koreas, the special envoy said, agreed to keep advancing the ongoing dialogues to defuse military tensions along the inter-Korean border, and to reach an agreement at the upcoming summit on concrete measures to build mutual trust and prevent military clashes.

Seoul and Pyongyang also agreed to open a joint inter-Korean liaison office, where representatives of the two sides reside, before the third Moon-Kim summit is held, while continuing necessary cooperation for it.

The two Koreas already completed necessary preparations, including construction and ways to jointly form and run, to open the joint liaison office at the DPRK's border town of Kaesong.

Chung said RoK will brief the countries concerned, including the United States, in detail on the outcome of the special envoys' visit to Pyongyang, and closely cooperate with them.