The South Korean participants, who had been selected by a computerized lottery system, were taken by bus to North Korea's Mount Kumgan resort in the demilitarized zone (DMZ) separating the two Koreas. Waiting lists for the reunions are long and as the would-be participants are often aged, some never get the chance: Last year alone, 3,800 South Koreans died without ever seeing their relatives

The reunions were started after a historic North-South summit in 2000. Twenty have been held since then, with the last occurring in 2015. The meetings take place at moments when there is a thaw in relations between the two former warring nations. The system used to select the North Korean participants is unknown, but is thought to be based on loyalty to the regime.

The participants will be allowed to meet six times for a total of 11 hours during their three-day stay, according to the South Korean news agency Yonhap. Four of the originally 93 families from the South that were selected ended up cancelling, as family members were too ill to make the journey to the North.

Families were brutally rent asunder by the Korean War, which ended in an armistice rather than a peace treaty, meaning that the two Koreas are theoretically still at war. The Korean Peninsula remains divided by the DMZ. Many South Koreans with relatives in the North, like this man, cherished the photos that reminded them of their loved ones during the long separation.

Many of the participants are frail with age, but their burning desire to see their loved ones again has given them the strength necessary to undertake the journey. The meetings have in the past brought together siblings, parents and children and husbands and wives. But such meetings between immediate family members are getting rare. Most are now with close relatives such as cousins.

As could be expected, the meetings can be highly emotional experiences — they are likely to be the only, and last, time relatives get to see each other.

Many South Koreans bring presents of clothing, medications and food for their relatives in the North, whose population lives in relative poverty. But the most important gift is simply the fact that they can see and hold one another.

Kim Il Sung, the first and "eternal" president of North Korea, took power in 1948 with the support of the Soviet Union. The official calendar in North Korea begins with his birth year, 1912, designating it "Juche 1" after the state's Juche ideology. He was 41 when, as shown here, he signed the 1953 armistice that effectively ended the Korean War.

In the years and decades after the war, Pyongyang's propaganda machine worked hard to weave a mythical narrative around Kim Il Sung. His childhood and the time he spent fighting Japanese troops in the 1930s were embellished to portray him as an unrivaled military and political genius. At the 1980 party congress, Kim announced he would be succeeded by his son, Kim Jong Il.

In 1992, Kim Il Sung started writing and publishing his memoirs, entitled "Reminiscences: With the Century." Describing his childhood, the North Korean leader claims that he first joined an anti-Japanese rally at 6 years old and became involved with the independence struggle at 8. The memoirs remained unfinished at Kim Il Sung's death in 1994.

After spending years in the top tiers of the regime, Kim Jong Il took power after his father's death. Kim Jong Il's 16-year rule was marked by famine and economic crisis in an already impoverished country. However, the cult of personality surrounding him and his father, Kim Il Sung, grew even stronger.

Historians outside North Korea believe Kim Jong Il was born in a military camp in eastern Russia, most likely in 1941. However, the leader's official biography claims it happened on the sacred Korean mountain Paektu, exactly 30 years after his father, on April 15, 1942. A North Korean legend says the birth was blessed by a new star and a double rainbow.

Kim Jong Il had three sons and two daughters with three different women. This 1981 photo shows Kim Jong Il sitting besides his son Kim Jong Nam, with his sister-in-law and her two children in the background. Kim Jong Nam was eventually assassinated in 2017.

In 2009, Western media reported that Kim Jong Il had picked his youngest son, Kim Jong Un, to take over as the head of the regime. The two appeared together at a military parade on 2010, a year before Kim Jong Il passed away.

According to Pyongyang, the death of Kim Jong Il in 2011 was marked by a series of mysterious events. State media reported that ice snapped loudly at a lake on the Paektu mountain during a sudden snowstorm, with a glowing message appearing on the rocks. After Kim Jong Il's death, a 22-meter (72-foot) statue of him was erected next to the one of his father (l.) in Pyongyang.

Kim Jong Un mostly stayed out of the spotlight before his ascent to power. His exact age is disputed, but he is believed to have been born between 1982 and 1984. He was reportedly educated in Switzerland. In 2013, he surprised the world by meeting with former NBA star Dennis Rodman in Pyongyang.

Like the leaders before him, Kim Jong Un is hallowed by the state's totalitarian regime. In 2015, South Korean media reported about a new teacher's manual in the North that claimed Kim Jong Un could drive at the age of 3. In 2017, state media said that a monument to the young leader would be build on Mount Paektu.

Altough Kim took power at a younger age and with less of a public profile than his father and grandfather, he has managed to maintain his grip on power. The assassination of his half-brother Kim Jong Nam in 2017 served to cement his reputation abroad as a merciless dictator. The North Korean leader has also vastly expanded the country's nuclear arsenal.