On the more troubled periods of conflict between the two nations, North Korea had described the South and their society practicing a culturally corrupt "bourgeois lifestyle". "On behalf of the North's authorities, I offer an apology and ask for your understanding for the wrong committed".
Kim's appearance comes a week after he shook up the Asian diplomatic landscape with an unexpected trip to meet Chinese President Xi Jinping in Beijing-his first overseas trip since taking power in 2011.
"All in all, Kim has astutely fractured the USA -led unified front to denuclearize the North", Nagy said.
K-pop girl band Red Velvet has a new superfan - North Korean leader Kim-jong-un, who apparently adjusted his schedule to watch them perform on Sunday in Pyongyang and singled them out for praise.
The reception from the North Korean audiences was warmer than expected and Red Velvet admitted that it made them relax and perform.
"We should hold culture and art performances frequently", Kim told South Korean performers.
"I understand people were curious to see if I would come to see Red Velvet's performance", Kim said, calling the show a "present" to North Korea's citizens.
During the games, the North had send a delegation of 22 members to the South, led by Kim Yong-nam, the country's ceremonial head of state and its highest ranking official.
Kim is to meet South Korean President Moon at a border village on April 27 and President Donald Trump in May in separate summit talks.
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A 2015 survey of North Korean refugees conducted by the US government's Broadcasting Board of Governors found that 77 percent of respondents said it had become more unsafe to listen to foreign radio under Kim. Korea's Joongang Ilbo reports that 12,000 North Koreans were allowed to attend the second performance.
While spring drills customarily result in soaring tensions on the peninsula, recent Pyongyang state media messaging has hinted to the North Korean public that there could be an upcoming warming in North Korean-US relations.
Also on Sunday, a South Korean taekwondo team performed at the Taekwondo Hall of Fame in Pyongyang.
It is a remarkable shift following a year of mounting tensions, accentuated by North Korea's nuclear and missile tests.
South Korean K-pop singers at the "Spring is Coming" concert, Pyongyang, North, Korea, April 1, 2018.
At around the same time, an order was issued to security authorities under the name of Workers' Party of Korea Chairman Kim Jong Un to step up monitoring and crackdowns on the unauthorized creation and distribution of computer and smartphone software by individuals.
Sung-Yoon Lee, a Korea expert at The Fletcher School at Tufts University in MA, echoed these claims, but said the implications would likely be short-lived.
He was also seen talking to members of Red Velvet, who have more than 4.6 million followers on Instagram.