President Moon welcomed Kim Yo-jong and another high-ranking North Korean official for lunch at the presidential residence, and she took the opportunity to extend an official invitation for Moon to visit North Korea.
But what hasn't been reported on lately is that aside from a joint hockey team and a few public appearances, nothing in North Korea has changed.
At a post-match press conference, North Korean player Jong Su Hyon sang the joint team's praises, saying, "One united is stronger than two divided".
"I never thought I would visit (the South) so suddenly and believed much would be odd and different but I saw many things that were similar or the same", said Kim Yo Jong in a toast during Sunday's dinner, adding she hoped to meet the "friendly faces" before her later in Pyongyang.
But Moon has also said that he would be willing to meet Kim only if he received assurances that the North would help resolve the crisis over its nuclear weapons program.
Ms Kim is the first member of North Korea's ruling dynasty to set foot in the South after the two sides separated following the Korean War in the early 1950s.
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During previous attempts at ending the crisis the United States and its allies have provided financial incentives to North Korea or agreed to suspend military exercises with South Korea.
And though the apparent thawing of tensions on the Korean Peninsula was well-received internationally, Boston University global relations professor Joseph Wippl said it could all be part of an effort by Kim Jong Un to extend the negotiating process.
The defense secretary went on to say that Song Young-moo, the South Korean minister of defense, told him in a face-to-face conversation that there was no "gap" between the the US and South Korea.
President Donald Trump tweeted his congratulations to South Korea for playing host a day before the Games began, but had been silent on the topic since.
Vice President Pence in a new interview published on Sunday said the Trump administration was open to talking with North Korea without preconditions.
Washington calls it a campaign of "maximum pressure".
North Korean supporters cheer during the preliminary round of the women's hockey game between Switzerland and the united Korean team. Pence, who led the U.S. delegation to the Olympics, has accused Pyongyang of using the event for its own ends. Matters are not so simple till the United States does not relinquish its hold on South Korea.
North and South Korean leaders swapped warm handshakes and smiles at Friday's opening ceremony, enabling the International Olympic Committee to present the Games as enablers of peace and take the media spotlight away from a Russian doping scandal that has plagued it for years.