"We know that Western media are planning pseudo-investigations on the theme of "Russian fingerprints" in hacking attacks on information resources related to the hosting of the Winter Olympic Games in the Republic of Korea", the nation's foreign ministry warned.
Shortly before the ceremony, the official Pyeongchang 2018 site stopped working, with users unable to access information or print tickets for events.
It cemented what has been a rapid improvement in Korean ties since North Korea - after months of fierce nuclear rhetoric and missile tests - agreed last month to attend its first Olympics in the South.
"The Olympics have been big for us in the past", said Joel Chudleigh, sales and marketing manager for the Strathcona Hotel, which features an array of drinking establishments catering to sports fans and another patrons.
South Korea's presidential office said after the meeting that the North Korean leader has invited Moon to visit his country and expressed willingness to improve inter-Korean ties in the letter.
There was the "state-promulgated sexism" of North Korea, whose delegation includes cheerleaders and a female orchestra that marched off a ship in matching winter coats.
"You can only enjoy your Olympic performance if you respect the rules and stay clean".
In a rare gesture, North Korean leader Kim Jong-un has invited South Korean President Moon Jae-in to hold inter-Korean dialogue in Pyongyang. It was only at the start of this year, and after many additional rounds of sanctions, that Kim Jong-un finally accepted the olive branch.
As he met with Pence on Thursday, Moon added his hope that it becomes "a venue that leads to dialogue for the denuclearization of the Korean Peninsula".
But there was one country's outfit that got people all over the globe talking: that of New Zealand's flag bearer Beau-James Wells, who wore what looked like a fur cape to the opening ceremony. Enter OAR, or Olympic Athletes From Russia, which is made up of "clean" Russian athletes who were allowed to compete.