The athletes will compete in ice hockey, ice skating and skiing across five disciplines - ice hockey, figure skating, short track speedskating, cross-country skiing and alpine skiing - the International Olympic Committee said.
Television footage showed a group of seven officials led by Hyon Song-Wol, the leader of the North's popular Moranbong band, crossing the heavily-fortified border on a bus before arriving at Seoul train station about an hour later.
The North Korean delegation had been scheduled to visit yesterday but cancelled just before the visit with no explanation.
The reconciliation mood between the Koreas began after North Korean leader Kim Jong Un said in a New Year's speech that he was willing to send a delegation to.
The IOC has approved that delegations from the two countries be marching together as one under the name "Korea" at the Opening Ceremony and led into the Olympic Stadium by the Korean Unification Flag, carried by two athletes from the two NOCs respectively.
North Korean Athletes Will Compete at Winter Olympics
South Korea's Unification Ministry said it had accepted the proposal for the two-day visit starting Sunday.
The countries also agreed to hold a joint cultural event at the North's scenic Diamond Mountain and a training session between non-Olympic skiers at the North's Masik ski resort ahead of the Olympics.
It came as a pleasant surprise to the world - perhaps the United States of America apart - when the porky lunatic Kim Jong-un announced that a handful of athletes, plus dignitaries and some undoubtedly entertaining singers and dancers would cross the border and perform.
In short track speed skating, Jong Kwang-bom in the men's 1,500 meters and Choe Un-song in the men's 500 meters will represent North Korea.
Seoul has proposed a joint ice hockey team, which triggered an angry response from athletes in the South suddenly being told they may have to play alongside total strangers.
The two Koreas made a decision to march under a single flag at the opening ceremony of the Winter Olympics to be held in South Korea later this year. Critics believe he may try to leverage the Olympics to weaken USA -led worldwide pressure and sanctions toughened due to North Korea's prolonged program of nuclear tests and missile launches.
Even as two Koreas reached deals over the Olympics, the North's state media accused the dovish Moon of "brown-nosing" the U.S. and threatened to withdraw its offer to join the Olympics if Seoul did not show enough respect. Three North Koreans will compete in the cross-country skiing and another three in the Alpine skiing slalom and giant slalom events.
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