The video began with Kim appearing on a balcony in the concert hall with his wife, Ri Sol Ju.
It was the first time for a North Korean leader to attend such a South Korean performance in the North.
A South Korean government official who spoke with pool reporters in Pyongyang Monday did say, however, that Seoul authorities wanted to add rapper Psy, best known for his worldwide hit "Gangnam Style" to the roster but were rejected by North Korean officials, who said Psy would "stand out" too much. They shared a few words as they headed to the second floor for the concert.
After the performance Kim and his wife met with the performers and shook hands with every singer.
Kim was quoted by the group as saying that people in the South were interested in whether or not he would meet them.
When South Korean boy band Shinhwa performed in North Korea in 2003 as part of a similar cultural diplomacy venture, the audience-dressed in suits and traditional dresses-greeted them with silence and stony stares.
Kim followed up by agreeing to summits with US President Donald Trump and the South's President Moon Jae-in.
Kim Jong Un surprised North and South Koreans - and the rest of the world - yesterday (April 1) by attending a K-pop concert in Pyongyang.
It kicked off with a performance by jazz pianist Kim Kwang Min, along with a hologram that depicted the theme.
Despite the North's isolation and strict curbs on unauthorised foreign culture, backed up by prison terms, K-pop has become increasingly popular in the North, thanks to flash drives smuggled across the border with China. "North Korean summit", he said. During a past period of detente, South Korea occasionally sent pop singers to North Korea, but that stopped in 2005.
Meanwhile, a South Korean taekwondo demonstration team also held a performance in Pyongyang on Sunday.
Baek Ji Young, one of the leading female vocalists in South Korea, took to the stage next.
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The Day of the Sun falls on April 15, when North Korean founder Kim Il Sung, Kim Jong-un's grandfather, was born in 1912.
South Korean singer Cho Yong-pil speaks to the media before departing for Pyongyang from Gimpo International Airport in Seoul.
Seohyeon sang for the last part of the individual performances.
Another concert, a joint North-South performance, is scheduled for Tuesday.
North Korea's leader makes an unexpected appearance, saying he wishes for another joint concert in the autumn in Seoul.
K-pop-characterized by its manufactured melodies and slick approach to marketing-has penetrated into North Korea over the past 10 years.
The North Korean leader's face was slightly flushed in a group photograph with the performers distributed by North Korean state media, while in another, he was seen directly addressing members of Red Velvet, who command more than 4.6 million followers on Instagram.
"It was our first time performing in Pyongyang and it was meaningful", said Lee Eui Seong, the captain of the South Korean squad.
Republican Sen. Lindsey Graham of SC said he's glad John Bolton will serve as Trump's national security adviser going into talks with North Korea because of his "very healthy skepticism". It feels great to spread our taekwondo.
"You honestly prepared (the performance)", Choe Hwi, chairman of the North's National Sports Guidance Committee, said after watching the show.
"(South and North Koreas) each have our own system of techniques, so it would be good to learn from each other", he said.
Yoon, who also performed in Pyongyang in 2002, recently explained to CNN his reason for performing.
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