evidence: South Korean President Moon Jae-in was waiting to greet him at the military demarcation line that has long divided the two Koreas. The two leaders shook hands at the line, and then, in a symbolic move, Moon joined Kim on the northern side of the line before they crossed into the southern side together. [...] A South Korean man weeps in Seoul as he watches Kim cross the military demarcation line. Woohae Cho/Getty Images Kim and Moon cross the military demarcation line together. Kim is the first North Korean leader to cross the line since fighting ended in the Korean War. Moon has been a longtime advocate of peace between the Koreas. Korea Summit Press Pool/AFP/Getty Images