Following the North Korean leader Kim Jong-Un's and South Korean President Moon Jae-In's summit in April and May, the two Koreas decided to open the liaison office at an early date in anticipation of increased cross-border exchanges.
From 2004 to 2016, the two Koreas operated the joint industrial complex.
South Korea's capital with the North's cheap and skillful labor had set a successful example of economic cooperation between the two Koreas.
But, in protest at the North's continued missile and nuclear provocations, South Korea closed the factory park in early 2016.
However, the opening of the liaison office is seen as a first step to implement promises the two leaders made in their recent summits.
In April, North and South Korea agreed to sign a peace treaty formally later this year, ending the 65-year old war between the two countries.
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