The outlook for next month's sporting extravaganza has brightened since North Korea confirmed its participation, lifting security concerns over the South's nuclear-armed neighbour.
The North has agreed to send an unknown number of athletes to the Games, expected to be accompanied by a high- level delegation, supporters, observers and an art troupe.
South Korean freestyle figure skater Park Hee-Jin raised the flame high before a crowd hundreds who were gathered in the capital's Sangam district in a ceremony held just weeks before the event on February 9-25.
"I am happy to become the first torchbearer in Seoul", Park, wearing a white and yellow ski suit and a bobble hat, told reporters.
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The skater, who took part in the Sochi Winter Olympics' qualifying rounds, then passed the flame to the next of more than 600 torchbearers who will lead it on a 103 km (64 mile) journey around the capital until Tuesday.
It will arrive late today at the main entrance to Gyeongbokgung Palace, the grandest of Seoul's historic sites, and will be carried in a sedan chair as hundreds of participants in traditional court costumes reenact a royal outing.
"Go Pyeongchang, Go Korea football", former Bundesliga player Cha said as he set off, with fans chanting his name.
The flame arrived in South Korea on November 1, 100 days ahead of the opening ceremony for the 2018 Pyeongchang Winter Games.
It has travelled throughout the country, relayed by a who's who of Korean sports and entertainment stars including Kim Yuna, who won the ladies singles figure skating at the 2010 Vancouver Olympics and the silver in the same discipline at the 2014 Sochi Olympics.
Overall, some 7,500 torchbearers will have taken part in the relay, covering more than 2,000 kms.
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