Eight days before the opening ceremony, the athletes were among a delegation that landed in Gangneung, on South Korea's east coast, after a rare direct flight between the two halves of the divided peninsula -- for which a special exemption had to be sought from US sanctions.
In black fur hats, they made their way through the terminal without saying a word to a pursuing pack of reporters and boarded buses that took them to the athletes' village.
In the past year tensions reached fever pitch as Pyongyang carried out a series of weapons tests -- including intercontinental ballistic missiles that brought the US mainland into range, and its most powerful nuclear blast to date -- while leader Kim Jong-Un and US President Donald Trump traded personal insults and threats of war.
But the Games have triggered a sudden apparent rapprochement between the two Koreas.
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For months, the North ignored repeated entreaties from Seoul for it to take part in a "peace Olympics", letting deadlines for registration slip by.
The two Koreas in January held their first high-level talks for two years at Panmunjom, the truce village in the Demilitarized Zone that splits the peninsula.
Pyongyang agreed to send athletes, cheerleaders, officials and an art troupe to the South, and both sides decided to march together under the unification flag at the opening ceremony, and form a joint women's ice hockey team.
Thursday's arrivals -- three cross-country skiers, three alpine skiers, two short-track speed skaters and two figure skaters -- will compete for the North.
It has been accorded its own three-letter Olympic code, COR.
- Foal Eagle -
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But the joint team has not met universal acclaim in the South, with critics saying that Seoul has made too many concessions to Pyongyang to secure its participation, and has effectively denied some of its own players the chance to compete on the Olympic stage.
At the same time, some say the North is seeking to gain advantage from its participation, and reports say it will mark the anniversary of the founding of its regular military with a major military parade a day before the opening ceremony.
"Pyongyang must stop acting unpredictably and fulfil agreements sincerely," the Seoul-based Korea Herald said in an editorial Thursday. "One cannot erase the impression that the South is trying hard not to pique the North."
And there are doubts about how long the warmth will last after the Games. Seoul and Washington agreed to delay the giant annual Foal Eagle and Key Resolve joint military exercises, which always infuriate Pyongyang, but only until the end of the Paralympics in March.
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The Pyeongchang Games have suffered none of the controversies over infrastructure delays that have marred previous Olympics, but have struggled with issues of their own.
Until it agreed to take part, the security threat from the North raised fears for athlete safety among some countries, and ticket sales have been slow.
As of Wednesday 799,000 out of 1.18 million tickets available had been sold, or 68 percent, with chief organiser Lee Hee-Beom admitting: "We have many expensive tickets left, so we need some emergency measures to boost ticket sales."
And hanging over the competition is the vast Russian doping scandal.
In December, the International Olympic Committee (IOC) said clean Russian competitors would be allowed to take part in South Korea under a neutral flag as "Olympic Athletes from Russia".
Those who want to do so are being forced to pass a unique set of anti-doping tests.
At first 500 were thought to be potentially eligible, before the number was cut to 389. And Russian Olympics officials said last week that only 169 had been approved.