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Kim Yo Jong

North Korean leader Kim Jong Un, second from right, and South Korean President Moon Jae-in, second from left, attend during a summit at Peace House of the border village of Panmunjom in the Demilitarized Zone, South Korea. At right is Kim's sister Kim Yo Jong.

Korea Summit Press Pool via AP

North Korean leader Kim Jong Un, front right, shakes hands with South Korean National Security Director Chung Eui-yong after Chung gave Kim the letter from South Korean President Moon Jae-in, in Pyongyang, North Korea.

Korean Central News Agency/Korea News Service via AP

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, second left, meets members of South Korean delegation headed by National Security Director Chung Eui-yong, center in right row, in Pyongyang, North Korea.

Korean Central News Agency/Korea News Service via AP

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center, his sister Kim Yo Jong, and Vice Chairman of North Korea's ruling Workers' Party Central Committee Kim Yong Chol meet members of South Korean delegation headed by National Security Director Chung Eui-yong in Pyongyang, North Korea.

Korean Central News Agency/Korea News Service via AP

South Koran President Moon Jae-in talks with Kim Yo Jong, North Korean leader Kim Jong Un's sister, during a performance of North Korea's Samjiyon Orchestra at National Theater in Seoul, South Korea.

Bee Jae-man/Yonhap via AP

South Korean President Moon Jae-in, right, walks with Kim Yo Jong, North Korean leader Kim Jong Un's sister, at the presidential house in Seoul, South Korea.

Kim Ju-sung/Yonhap via AP

North Korea's nominal head of state Kim Yong Nam, left, wipes his tears as South Koran President Moon Jae-in, right, Kim Yo Jong, North Korean leader Kim Jong Un's sister, and Hyon Song Wol, second from left, leader of North Korea's Samjiyon Orchestra, applaud after a performance of North Korea's Samjiyon Orchestra at National Theater in Seoul, South Korea. A rare invitation to Pyongyang for South Korea's president marked Day Two of the North Korean Kim dynasty's southern road tour, part of an accelerating diplomatic thaw that included some Korean liquor over lunch and the shared joy of watching a "unified" Korea team play hockey at the Olympics.

AP/ PTI