Some set a North Korean flag on fire before police intervened, and others chanted "Let's tear Kim Jong Un to death!" as they ripped up posters bearing his portrait.
After arriving at the South's ultramodern Incheon International Airport- the North's flagship airline is subject to sanctions - she traveled to Pyeongchang for the opening ceremony, where the North and South Korean athletes marched together behind a blue-and-white "unification" flag for the first time in more than a decade.
Kim on Saturday, February 10 invited Moon to a summit in the North, an offer extended by his sister and special envoy Kim Yo Jong, who made history as the first member of the North's ruling dynasty to visit the South since the Korean War.
During the bilateral talks over lunch, neither side made mention of Pyongyang's nuclear issue, which is attracting worldwide attention as a major security concern and has heightened tensions, a presidential office source said.
Loud applause greeted the appearance of Moon, Kim Yo Jong and her delegation at the concert, attended by more than a thousand people.
Moon expressed "deep thanks" to the North's leader for sending the high-level delegation to the Olympics and for his personal letter and verbal greetings, KCNA said.
President Trump's right-hand man was at the Gangneung Ice Arena on Saturday night to watch the opening session of short-track speedskating and, for the second evening in succession, he was unable to avoid a connection to North Korea.
Kim Yo Jong shook hands with South Korean President Moon Jae-in, cheered enthusiastically for a unified Korean team, and displayed a sense of humor in weekend meetings.
Sunday's lunch will take place at the Walker Hill hotel in eastern Seoul, officials said. In it, Kim Jong Un highlighted several huge intercontinental ballistic missiles, which were successfully flight tested three times past year and could reach deep into the US mainland when perfected.
"A Kim-Moon summit will certainly happen and we can expect Seoul and Pyongyang to make sure it does", said Kim Duyeon, a senior visiting fellow with the Seoul-based Korean Peninsula Future Forum. And although it remains some distance away from possessing a credible nuclear arsenal - CIA Director Mike Pompeo has said Pyongyang is "a handful of months" from being able to strike the US - it is well-placed to achieve that goal.
The countries are still technically at war since a 1953 armistice, though they have resumed talks after a year-long standoff between North Korea and the United States in which an exchange of threats between the heads of state elevated tensions and prompted the North's continued missile and nuclear tests.
Speaking to reporters later aboard Air Force One, Pence reiterated that there was "no daylight" between the U.S., South Korea and Japan in pushing to isolate North Korea until Kim abandons his nuclear program.
Samsung is giving a PyeongChang 2018 edition of its Galaxy Note 8 to Olympians and officials at the Winter Games, but North Korea's athletes aren't getting the high-tech giveaway.
But Moon, a liberal who has always wanted to engage the North, will also have to convince a good portion of his own people who are deeply wary about North Korean intentions.
Washington calls it a campaign of "maximum pressure".
"Now is not the time to postpone U.S". -South Korea alliance were evident immediately after the announcement.
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