A visit by South Korean President Moon Jae-in to the DPRK would only be the third inter-Korean summit to take place. Here's a summary of the previous inter-Korean summits.
An unprecedented meeting took placed in June, 2000.
Then South Korean President Kim Dae-jung visited Pyongyang for an inter-Korea summit with the late DPRK leader Kim Jong Il--the first such meeting after 70 years.
This meeting saw the signing of a joint communique on reconciliation, and led to a series of reunions of separated families.
Later that year, Kim Dae-jung won the Nobel Peace Prize for his "Sunshine Policy" toward Pyongyang.
The two sides held frequent ministerial-level talks for a few years after the summit, but they waited for seven years for the second summit between top leaders.
The 2007 summit was between Kim Jong Il and then South Korea President Roh Moo-hyun, who crossed the Demilitarized Zone in a highly symbolic moment.
The summit culminated in an eight-point agreement, building on the 2000 joint communique.
Both of the summits took place when South Korea was under liberal presidents who sought rapprochement with the DPRK despite conservative criticism.
Now talks of a third summit flared again, when South Korea's current liberal President Moon Jae-in was invited to visit the DPRK.
It would be the first summit in more than a decade. President Moon said in response that the two sides should make it happen.
It might be a bumpy road to work towards a third summit, but it's a sign that the inter-Korea relations are back on track toward peace.