Tensions between the two soared previous year as Pyongyang tested missiles capable of reaching the US mainland and its most powerful nuclear device to date, while Kim Jong Un and US President Donald Trump traded personal insults and threats of war.
The rapprochement pushed by Mr Moon has angered conservatives, who accused him of being a North Korea sympathiser. Then when the Korean team entered the stadium under a unified flag, Pence sat stone-faced while Moon and North Korean officials stood together in applause.
Three people playing the roles of President Moon, the North Korean leader and Kim Yong-nam, North Korea's ceremonial head of state, respectively, walked in silence, tied to each other by a rope.
A visit by Moon to the North would enable the first summit between leaders from the two Koreas since 2007, and would mark only the third inter-Korean summit to take place.
Kim Yo-jong, who also serves as a senior official in the North, was part of the reclusive state's delegation that attended Friday evening's opening ceremony for the 2018 Winter Olympics in South Korea.
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Moon has expressed his intention to use the Winter Olympics as a chance to make diplomatic inroads with the North and restore normalcy, following months of high tensions on the Peninsula.
He also suggested that North Korea should engage in talks with the United States. He also said the ceremonies were not the appropriate venue for serious talks.
To achieve this, he'll obviously have to walk a precarious diplomatic tightrope between his ally, the U.S. and his old enemy, North Korea.
Farah in her tweet referenced the death of American Otto Warmbier, who died last year after being held prisoner for almost two years in North Korea.
The Korean Central News Agency (KCNA) on Sunday reported the match of women's ice hockey between the joint team of the DPRK and South Korea, and the Swiss team held Saturday night.