Thousands of families have been separated with little contact made since 1953 when hostilities ended.
The sporadic reunions depend hugely on the state of relations, and the North is known to have cancelled a few. The last one was held in February 2014.
Each meeting gets deluged by tens of thousands of applications from South Korea, but only a tiny percentage get selected. The last meeting saw 100 from each side attending, in a hugely emotional event.
The discussions come after a tense few weeks on the Korean peninsula, which saw exchanges of fire at the border and the evacuation of thousands of South Koreans from the border region.
The tensions began when a border landmine injured two South Korean soldiers - South Korea responded by broadcasting propaganda messages into the North.
The two sides reached an agreement to defuse the situation after marathon talks.
The North, which denied planted the mine, agreed to express "regret" about the incident - though later clarified this was an expression of sympathy not an apology.
The two countries remain technically at war as the Korean War only ended in an armistice.
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