Kim Yo-jong was born to Kim Jong-il and his wife Ko Yong-hui on 26 September 1987.[1] She and her brother, Kim Jong-un, are said to have a close relationship,[3] due to shared isolated years while studying together in Switzerland from 1996 to 2000, and in North Korea, "where social and emotional isolation appears to have been a defining force in their early lives"[4] possibly because their father Kim Jong-Il wanted to bring them up away from the influence of his father Kim Il-sung.[5] She may have studied at the Kim Il-sung Military University after her return.[2] She also studied computer science at Kim Il-sung University where she is said to have studied with Kim Eun-gyong, the daughter of Japanese abductee Megumi Yokota.[6]