A North Korean art troupe put on a concert in Seoul on Sunday to celebrate the ongoing Pyeongchang Winter Olympics, with President Moon Jae In and the North's high-ranking delegation, including its leader Kim Jong Un's sister, in attendance.

Kim Yo Jong, the leader's special envoy, and Kim Yong Nam, the country's nominal head, and other delegates are set to return home later in the day, wrapping up their three-day visit to South Korea.

The Samjiyon Orchestra, consisting of a total of 140 singers, musicians and other members, arrived Tuesday in the eastern port city of Donghae aboard the North Korean ferry Mangyongbong-92. On Thursday, it held a concert in neighboring Gangneung, which is hosting the venues of such Olympic sports as ice hockey and skating.

After Kim Jong Un held out an olive branch in his New Year speech, North Korea agreed in January with South Korea to send athletes, coaches and others to the Olympics.

As part of the agreement, the two Koreas marched together under a unified flag in the opening ceremony on Friday and formed a joint women's ice hockey team.

The high-level delegation, led by Kim Yong Nam, arrived at Incheon International Airport outside Seoul on Friday and attended the Games' opening ceremony along with other world leaders such as U.S. Vice President Mike Pence and Japanese Prime Minster Shinzo Abe.

Kim Yo Jong, viewed as one of the closest aides to her brother, and Kim Yong Nam held rare talks with Moon on Saturday, during which she delivered a personal letter from her brother requesting that the president visit Pyongyang at an early date.

The request marked the latest of the North's attempts to improve inter-Korea ties amid heightened tensions over its nuclear and missile programs.

Some observers suspect Pyongyang of cozying up to Seoul as part of a strategy aimed at weakening international sanctions as well as driving a wedge between South Korea and the United States, its longtime ally.