South Korean President Moon Jae-in and North Korean leader Kim Jong-un plan to visit a volcano sacred to the North on the last day of Moon's visit.
Moon's office said on Wednesday that Moon had accepted Kim's offer to visit Mount Paektu on Thursday.
The volcano topped with a deep crater lake is at the heart of North Korea's foundation mythology used to legitimise the Kim family's dynastic rule.
Members of the Kim family are referred to as sharing the "Paektu Bloodline".
The mountain on the North Korean-Chinese border is also emblazoned on the country's national emblem and lends its name to everything from rockets to power stations.
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According to the official narrative, Kim Il Sung saved the Korean Peninsula with daring guerrilla raids against Japanese invaders from his base on the slopes of Paektu.
South Korean historians say the tale is exaggerated.
At a summit of the two leaders on Wednesday in Pyongyang, the North agreed to permanently dismantle a missile engine test site and a launch pad and to take further steps such as permanently dismantling its main Nyongbyon nuclear complex if the US takes corresponding measures.
