NORTH KOREAN media have disclosed so little about the personal life of the leader, Kim Jong-un, that no one outside his innermost circle knows his age or marital status.
Now Koreans on both sides of the divided peninsula have a new mystery to ponder: who is that elegant young woman at his side?
The same slender twenty-something woman seen with Kim at a Friday night concert in Pyongyang showed up with the young leader at a memorial ceremony on Sunday marking the 18th anniversary of the death of his grandfather, North Korea's founder Kim Il-sung.
Dressed in a tailored black skirt suit, her short hair tucked behind her ears, the woman applauded and bowed in unison with Kim during both public appearances.
Her unexplained presence has set off speculation that she might be his wife or perhaps a younger sister. The KRT broadcast network, the Rodong Sinmun newspaper and the Korean Central News Agency all carried photos or footage of the couple, but none identified the mystery woman.
Cheong Seong-chang, a North Korea analyst at the Sejong Institute in South Korea, said Kim had a sister born in 1987. But images of the woman with him did not evoke much family resemblance.
Friday's appearance at a concert that featured Disney characters has prompted Disney to issue a statement saying it did not authorise North Korea's use of the company's characters.
Los Angeles Times, Bloomberg