Athletes from the two countries carried the flag of Korean Unification that led the group in its parade at the Olympic Stadium, where they were welcomed with a standing ovation.
North Korea sent nearly 500 representatives, including athletes and 230 people state-sanctioned cheering team to PyeongChang to join with South Korea's delegates in an attempt for the rival nations to revive diplomatic communications.
The highest profile member of the North Korean delegation to the Games, Yo-jong is the first immediate member of the North's ruling family to visit the South since the 1950-1953 Korean war.
The North-South Olympics detente has raised concerns in Washington and Tokyo that Seoul may ease up on a "maximum pressure" campaign by the United States and its allies to get Pyongyang to abandon its nuclear and missile programs.
Joint military exercises and sanction implementation should continue as scheduled, if North Korea continues to refuse any discussion dealing with the denuclearization of the Korean Peninsula. "But if you want to talk, we'll talk".
A senior White House official said Pence was not trying to avoid the delegation from North Korea but rather ignore them, according to the AP.
Could Olympic Games Bring North and South Korea Together?
That may be a bridge too far for the Kim regime, which is adamant that the worldwide community accept its nuclear status. There are other spoilers that could torpedo the new opening.
South Korean President Moon Jae-in, a staunch supporter of dialogue with the North, has done everything to make the Olympic rendezvous peace and help calm the situation on the peninsula.
And as Seong-ho returned to South Korea after making a rousing appearance at President Donald Trump's State of the Union address last week, he was met with the father of another victim who suffered at the hands North Korean leader Kim Jong Un.
North Korea has sent a delegation of 22 athletes to compete in five disciplines, with their women's ice hockey players to compete in a unified Korean team.
On Sunday, South Korean President Moon Jae-in sat next to Kim's powerful sister at a concert in Seoul by musicians from Pyongyang.
Moon, on the other hand, has repeatedly stressed the need to keep the inter-Korean dialogue moving forward, so they may lead to a resumption of worldwide negotiations on ending the North's nuclear ambitions.
It was not immediately reported whether the North Korean leader's sister would attend the evening match against Switzerland.