Moon apparently cited the conditions necessary for an inter-Korean summit. She also repeated the invitation directly to Moon to visit at a time convenient to him, he said. "We're not going to let the North Korea propaganda machine hijack the messaging of the Olympics", his communications director, Jarrod Agen, told the Washington Post. South Korea's former presidents Kim Dae Jung and his successor Roh Moo Hyun held summits with North Korean leader Kim Jong Il in 2000 and 2007, respectively. Dozens of South Koreans at the airport tried to snap photographs of her on their mobile phones. As a sign of her status, the elder Kim Yong Nam offered her the seat of honor at the airport meeting, but she politely declined. Later, he skipped a formal dinner at which he was due to share a table with North Korea's ceremonial head of state Kim Yong Nam.
Many analysts are skeptical about Kim Jong Un's motivations for this sudden outreach, especially as he continues to assert his desire to press ahead with his nuclear weapons program to fend off the "hostile" United States.
The North's Olympic "detente" is a striking shift in tactics.
And as the South appeared to look favorably on warming ties on the Korean Peninsula, Pence insisted Saturday "there is no daylight" among the United States and allies South Korea and Japan in intensifying pressure on the North over its nuclear and missile programs. Before now, she had been seen mainly in photos, but often in the background, as her brother took center stage.
Her visit makes her the first member of the dynasty to set foot in the South since the end of the Korean War in 1953.
Kim Yo Jong and the rest of the North Korean delegation sat next to Vice President Pence at the Olympic's opening ceremony Friday, but they did not speak or acknowledge each other.
Past "charm offensives" have been interpreted as North Korea trying to recoup from crippling sanctions on their nuclear program, or trying to drive a wedge between Seoul and its US ally.
Moon assured Pence he would tell the North Koreans clearly that they would not get economic or diplomatic benefits for just talking - only for taking concrete steps toward denuclearization.
For security reasons, few details of Kim Yo Jong's three-day itinerary have been made public.
Amid South Korea's efforts to promote dialogue between the United States and North Korea, U.S Vice President Mike Pence reportedly signaled that Washington is ready for talks, marking a notable change of stance.
It was an emotionally charged moment.
Leaders of the two Koreas have only meet twice since the peninsula was divided in 1948.
It wasn't until this week that the world learned Kim Yo Jong would join her nation's Olympic delegation. President Donald Trump has belittled North Korea's leader Kim as "little Rocket Man" and threatened to respond to threats with "fire and fury".
Pence said Friday the USA would oppose talks between the two Koreas until the North agreed to open negotiations on ending its nuclear program.
Then, after Pence had departed for home, Moon went to the women's ice hockey match with the North Korean delegation, including Kim Yo Jong.
In general, the USA and its allies were against the North Korean parade being held, calling it provocative.
The 90-minute performance ended without an encore despite the audience's request, but a North Korean host of the event thanked spectators for the warm welcome.