North Korean leader Kim Jong Un will walk across the border between the two Koreas to attend Friday's inter-Korean summit, the first in over 10 years, to discuss denuclearization and peace issues, according to details and schedule released by South Korea.

At around 9:30 a.m., Kim will become the first North Korean ruler to cross the border separating the two technically warring countries, as the 1950-1953 Korean War only ended in a cease-fire. South Korean President Moon Jae In will greet him and the two will start their official meeting from around 10:30 a.m.

"Above everything else, denuclearization and establishing permanent peace on the Korean Peninsula is the focus of the summit," Im Jong Seok, chairman of the summit preparation committee, said while announcing the schedule to reporters, adding that the leaders are expected to sign some sort of agreement the same day.

The agreement could include a reference to North Korea's commitment to denuclearize, as has been hinted at in recent months. South Korea hopes to include that in the document to lay the groundwork for the envisioned summit between Kim and U.S. President Donald Trump, to be held by early June.

(Peace House, Panmunjeom)

Im said it has not yet been decided how information about the agreement will be released. He also said it is up to Moon and Kim to come to a consensus on North Korea's denuclearization.

South and North Korea are also exploring the possibility of setting up liaison offices in each other's capitals and the issue may be dealt with during the summit talks, a South Korean source familiar with the situation said.

Before the summit talks start inside a South Korean facility known as Peace House in the truce village of Panmunjeom, Kim will review a South Korean military honor guard.

In past inter-Korea summit talks held in Pyongyang in 2000 and 2007, South Korea's leaders similarly inspected North Korean honor guards, according to Im.

The latest summit talks will be divided into morning and afternoon sessions. Between the sessions, the two leaders will eat lunch separately and then jointly plant a commemorative pine tree on the Military Demarcation Line -- a symbol of confrontation and division since the Korean War.

The demarcation line runs through the middle of the heavily fortified Demilitarized Zone, a 4-kilometer wide, 250-km-long stretch of land.

The pine is a "tree beloved by the Korean people," and a mixture of soil taken from the highest mountains of both countries will be used in the planting, according to Im. The two leaders will wet the roots of the freshly planted tree with water from rivers flowing through their capitals, in a gesture of hope for peace and prosperity.

(Korean soldiers from the South, front, and the North face each other across the border)

After the tree-planting ceremony, they will take a stroll around the area and continue their talks.

The two leaders will have dinner together from 6:30 p.m., to be followed by a farewell ceremony.

Im said it has not yet been decided whether Kim's wife Ri Sol Ju will travel with her husband, but added that the South Korean government is "hoping that she will be able to attend the afternoon program or dinner."

Delegates from North Korea will include ceremonial leader Kim Yong Nam and Kim Yo Jong, the North Korean leader's sister and close aide who serves as the first vice department director of the Central Committee of the ruling Workers' Party.

While another rehearsal was conducted Thursday, Moon "spent his time reading all the material over and over again," focusing on the "substantial content that will be discussed tomorrow," presidential spokesman Kim Eui Kyeom told a press conference later in the day.

Moon was also feeling "a lot of pressure" ahead of the closely watched summit, but he seemed to have gotten over it, the spokesman added.