Kim Yo Jong, the powerful sister of North Korean leader Kim Jong Un, was among a high-level delegation in the stands as the joint Korean women's ice hockey team took on Switzerland in their opening match.
The Games have triggered rapid reconciliation between the two Koreas, who are still technically at war. In talks on Saturday, South Korean President Moon Jae-in was invited to a summit with North Korean leader Kim Jong Un.
There was joy for South Korea when short-track speed skater Lim Hyo-jun won the first gold for hosts on day one, claiming the men's 1500m in front of a near-capacity crowd.
Five gold medals were up for grabs on day one, concluding with Kamil Stoch's attempt to become the first back-to-back ski jumping champion in the normal hill.
The two Koreas marched together at yesterday's opening ceremony but they have never before competed side-by-side at an Olympics.
Among the crowd was a large number of North Korea's all- female "Army of Beauties" cheer squad, known for their tightly choreographed moves and chants.
North Korean cheerleaders let rip in support for Choe Un Song but he was eliminated in the heats for the 1,500m short- track speed skating, failing to reach the semi-finals.
- Internet shutdown -
Earlier, Kalla won the skiathlon race ahead of Norway's Marit Bjoergen, preventing her from collecting an unprecedented third straight gold medal in the event.
But Bjoergen still became the most decorated woman in Winter Olympics history as she claimed her 11th medal. Third came Finland's Krista Parmakoski.
In biathlon, Germany's Dahlmeier took the honours in the women's 7.5km sprint ahead of Norway's Marte Olsbu and Veronika Vitkova of the Czech Republic.
Carlijn Achtereekte made her Olympic debut a golden one, leading a Dutch podium sweep in the women's 3,000-metre speed skating.
Ireen Wust, the 2006 and 2014 champion, was a narrow second with Antoinette de Jong third.
Elsewhere, organisers probed a mysterious shutdown of the Games' internal internet and wifi, which follows warnings of cyberattacks.
Internal internet and wifi systems crashed at about 7:15 pm yesterday and were still not back to normal at midday on Saturday, Games organisers said.
The outage follows warnings of malware phishing attacks targeting organisations working at the Olympics, and allegations of cyberattacks from Russia -- which has denied any involvement.
"We don't want to speculate because we're still trying to find out what the root source is," said Nancy Park, a spokeswoman for the Games organisers.
The shutdown started just before yesterday's opening ceremony, where Moon twice shook the hand of Kim Yo Jong, the first member of North Korea's ruling dynasty to venture south since the 1950-53 Korean War.
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