Officials today said the meeting was requested by North Korea, which has launched a recent charm offensive after raising tensions last spring with repeated threats of nuclear strikes against Seoul and Washington.
Later this month, the two Koreas are to hold reunions of families separated since the 1950-53 Korean War for the first time in more than three years.
Tomorrow's meeting has no fixed agenda, but the two sides are expected to discuss how to make the reunions run smoothly and whether to pursue them regularly, South Korean Unification Ministry spokesman Kim Eui-do told reporters.
But outside analysts say it's unlikely that North Korea will halt the reunions this time because it needs improved ties with South Korea to help attract foreign investment and aid.
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Heavy snowfall at the North Korean resort set to host the reunions, however, has raised worries about the venue.
South Korea will send a vice-ministerial-level official to the meeting tomorrow, while North Korea will send senior ruling Workers' Party official Won Tong Yon, a veteran official specialising in ties with Seoul, officials said.
Nuclear envoys met in 2011 on the sidelines of a regional security forum in Indonesia. Since then, ties have become increasingly bad. Last June, plans to hold a high-level meeting fell apart because of a protocol dispute over who would represent each side.
North Korea is expected to demand tomorrow that South Korea agree to restart a lucrative joint tourism project in North Korea, increase humanitarian aid and downsize the upcoming military drills with the US, said Yoo Ho-yeol, a professor at Korea University in South Korea.