Athletes from 48 nations paraded into the stadium on Friday, braving the freezing -5C conditions.
The competition will continue for 10 days.
Canada had a successful first day, with 20-year-old Mac Marcoux of Sault Ste. She shared the podium with Russians Katerina Rumyantseva and Anna Milenin, who are performing as neutral paralympic athletes after Russia was barred from flying its flag at the Winter Games for systematic, state-organize drugs cheating.
ParalympicsGB has sent a 17-strong team of athletes, though only snowboarders Pick, Ben Moore and James Barnes-Miller, and Kelly Gallagher attended the ceremony, with the remaining athletes due to compete on Saturday.
Sin clocked a time of 42 minutes, 28.9 seconds at Alpensia Biathlon Centre in PyeongChang, some 180 kilometers east of Seoul to finish third among 27 competitors.
There was a silver lining, though, in the unity among the two torchbearers - one North Korean and one South Korean.
South Korean President Moon Jae-in officially declared the biggest Winter Paralympics in history open, before a show of fireworks lit up the night sky above the stadium. They marched separately from the South Koreans.
At one point a young girl directed illuminated fish that were swimming in the arena floor.
International Paralympic Committee President Andrew Parsons said in a speech that a record number of countries are feeling at home in PyeongChang, thanks to the warm welcome they received.
Three nations - North Korea, Georgia and Tajikistan - made their debuts at the Winter Games.
The Paralympic Games 2018 will be held until March 18.
"We were still negotiating right up until the very last moment".