The aunt of North Korean leader Kim Jong-un is planning to file a defamation suit against three high-profile North Korean defectors in the South, her legal representative said Wednesday.

Koh Young-sook, the current leader's aunt and the younger sister of Kim's mother, will file a suit with the Seoul Central District Court later in the day. She is seeking a total of 60 million won ($51,900) from three defectors for allegedly spreading false information about her on South Korean TV shows between 2013 and 2014, lawyer Kang Yong-seok said.

Koh took care of the North Korean leader when he was studying in Switzerland, and defected to the United Sates with her husband in 1998.

According to Kang, Koh's husband Lee Kang came to his office in Seoul and designated three defectors -- a former North Korean agent, a son-in-law of a former North Korean prime minister and an ex-diplomat -- as the defendants.

They are suspected of making remarks that Koh ousted Kim Jong-un's elder brother Kim Jong-nam and that she has been gambling or having plastic surgery with former leader Kim Jong-il's slush fund money, according to the lawyer.

"The defendants defected to South Korea in the 1990s, lacking knowledge of the current situation in the North, but they still talked about things that are far from the reality," Lee was quoted as saying.

Lee is known to have left South Korea. (Yonhap)