Kim Eui-kyeom, South Korean president's spokesman, said at a news conference in Seoul on Saturday that the North Korean delegation delievered the invitation letter at a landmark high-level meeting at the presidential palace in Seoul.
Moon and the two North Korean delegates cheerfully clapped and waved as the athletes from the two Koreas jointly marched during the ceremony holding a blue-and-white flag symbolizing a unified Korean Peninsula.
Choi Bok-mu, a fitness club manager at the Olympics athletes village in Gangneung, said he had not experienced any problems communicating with North Korean athletes, despite them speaking in a markedly different accent.
Moon and Kim Yo Jong broke out broad smiles as they shook hands ahead before the start of the opening ceremony at Pyeongchang's Olympic Stadium.
Fred Warmbier also attended the Opening Ceremonies, although he did not sit in the VIP box.
Moon met Kim Yo Jong and the North's ceremonial head of state Kim Yong Nam for talks and lunch at the Blue House today.More news: Elon Musk sends Tesla Roadster into space
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South Korean President Moon Jae In has rejected a request by Japanese Prime Minister Shinzo Abe to swiftly resume the country's joint military drills with the United States, his office said Saturday.
Officials traveling with Pence said it would be fair to characterize his failure to interact with the North Koreans as a mutual decision, with neither side making any public overtures. Kim Yo Jong arrived here Friday as part of a delegation to the Olympics. Pence waited outside while Moon spoke because he was late, according to a spokesman for South Korea's presidential Blue House.
Kim Yong Nam, president of the Presidium of the Supreme People's Assembly who is leading the DPRK delegation, joined the dinner together with Choe Hwi, chairman of the National Sports Guidance Committee, and Ri Son Gwon, chairman of the Committee for the Peaceful Reunification of the Fatherland.
"We are determined to make sure that even in the midst of the powerful background & idealism of the Olympics, the World is reminded of the truth about North Korea", Pence tweeted on Friday. It was built in the 1960s as a luxury facility for US troops stationed in the South.
A DPRK taekwondo demonstration team has also come to demonstrate the traditional Korean martial art during the Winter Olympics.
"The vice present cheered for the team he's rooting for".