Officials of the South Korean presidential palace say Moon told Kim Yo Jong words of appreciation about her attendance at the opening ceremony until late hours despite the cold temperature. There's even speculation of a summit between Kim and Moon.
Analysts say Kim Jong Un's decision to send his sister to the South reflected an eagerness to break out of diplomatic isolation by improving ties with the South, which the country could eventually use as a bridge to approach the United States.
Kim Yo Jong, 30, is an increasingly prominent figure in her brother's government and the first member of the North's ruling family to visit the South since the end of the 1950-53 Korean War.
The North's presence in the South has dominated Olympic headlines, with the winter sports festival triggering a flurry of cross-border trips culminating in the diplomatic delegation.
She and Kim Yong Nam, the North's 90-year-old nominal head of state, were seated behind Moon and his wife, while Pence and his wife were seated beside the Moons and Japanese Prime Minister Shinzo Abe.
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. Pence was also at the dinner and reportedly refused to shake the elderly North Korean's hand.
All eyes have been on Kim Yo Jong, who has rapidly risen up the ladder since her brother inherited power from their father.
U.N. Secretary-General Antonio Guterres, who sat near Kim Yong Nam at the dinner, had a brief exchange with him and "reiterated his expectation and hope that all parties will use dialogue to achieve the denuclearization of the Korean Peninsula", U.N. deputy spokesman Farhan Haq said.
A look at notable quotes from the Pyeongchang Winter Olympics
The judges did not agree with the naysayers. "We didn't know what to expect", said Moir about his third Olympics adventure. The original move from January's nationals can be seen at the 2:26 mark in the video below.
The visit of the delegation, which included North Korean leader Kim Jong Un's younger sister Kim Yo Jong, intrigued many in South Korea, but also met scepticism about the North's sincerity and willingness to give up its pursuit of nuclear weapons.
The luncheon at the Blue House came after Kim Yo Jong and other North Korean delegates attended the opening ceremony of the Pyeongchang Winter Olympics, which has brought a temporary lull in tensions over the North's nuclear program.
The North has refrained from further provocations since testing an intercontinental ballistic missile in November.
Fred was invited by Vice President Mike Pence for the opening ceremony of the 2018 Winter Olympics. The two will be attending the opening ceremony, where a North Korean delegation will also be present. Analysts say that the missiles, which were successfully flight tested three times previous year, could potentially reach deep into the US mainland when perfected. It was built in the 1960s as a luxury facility for USA troops stationed in the South.
Dressed in long, white padded jackets, they followed the flag with a blue silhouette of the Korean Peninsula against a white background.
The first hockey match featuring the joint North-South women's ice hockey will be held Saturday night - they play Switzerland, where both Kim Jong Un and his sister went to school when they were children - and that would be an event she might want to see.
The North has sent almost 500 people to the Pyeongchang Games, including officials, athletes, artists and also a 230-member state-trained cheering group after the Koreas agreed to a series of conciliatory gestures for the games.