SEOUL, South Korea — Three of the most trusted aides to the North Korean leader Kim Jong-un arrived in South Korea on Saturday to attend the closing ceremony of the Asian Games in a highly unusual trip that could perhaps signal an easing of the tense relations on the divided Korean Peninsula.

The one-day trip by the 11-member North Korean delegation led by Hwang Pyong-so, the top political officer of the North Korean military, will include meetings with senior South Korean officials, including Ryoo Kihl-jae, the unification minister, and Kim Kwan-jin, the top national security adviser for President Park Geun-hye, said Lim Byeong-cheol, a government spokesman.

The meetings would mark the highest-level government dialogue since Ms. Park took office in February last year. Mr. Lim said he did not know whether the North Koreans were carrying a letter from Mr. Kim to Ms. Park. The South Korean leader did not plan to attend the closing ceremony on Saturday evening in Incheon, a port city west of Seoul.

The surprise trip by the North Korean delegates was announced by the South Korean government only an hour before their arrival.