Jang's younger sister burst into tears during the conversation.
"Every time a train passes by, I thought (about you)," Jang Keum Soon told her South Korean brother, sobbing. "I missed you, older brother."
Jang's son vowed to his North Korean aunt and uncle: "I will drive a train and come here. I am a locomotive engineer so I will drive the train and promise to come back. Until then, please stay healthy and live a long life."
Although delayed by snow, 82 South Korean participants accompanied by 58 other members arrived Thursday afternoon and were scheduled to have lunch before finally meeting their families.
The reunion ended for the day around 5 p.m.
Trust remains tenuous in the peninsula, separated by the world's most fortified border---the Demilitarized Zone and rocked by North Korea's nuclear test last year.
The rarity of inter-Korea reunions meant that many participants in ill health insisted on going to Mount Kumgang for the event, desperate for a chance to see their relatives. Nineteen of the South Korean participants were in wheelchairs.
Two South Korean participants departed for the reunion venue by ambulance, one of them was receiving an IV drip, refusing to miss the date.
South Korean participants of the reunion were seen bringing gifts for their family members. The most popular gifts for families in North Korea were Choco Pies, a chocolate-covered treat, along with medicine and medical supplies like pain killers, according to YTN, a CNN affiliate in South Korea.
They were greeted with a newly-made stone near their North Korean facilities that read: "Long Live General Kim Jong Un, The Sun of Military First Korea."