North Korea is unique in turning a putatively communist state into a dynastic system now in its third generation. So while the proposition that Kim Jong-un’s teenage daughter will inherit power is sparking debate, unexpected political transitions are not entirely new. On Monday, South Korea’s intelligence agency said that it had “credible” information that Kim Ju-ae is positioned as her father’s successor. Its briefing to legislators in Seoul followed appearances alongside her father highlighting her military credentials – including driving a tank – and months of rhetorical inflation, with state media describing her as “a great person of guidance”.The Mount Paektu bloodline…