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Duan Weihong went missing from her Beijing office a few weeks after Sun Zhengcai was brought down, with her executives and assistants disappearing simultaneously, and was subsequently detained by the CCP Central Commission for Discipline Inspection.
In July 2017, Sun Zhengcai was suddenly investigated and expelled from the CCP. He and Hu Chunhua were once seen as candidates for the sixth-generation leadership; his downfall marked a turning point for the succession plans Hu Jintao had left for himself.
Duan Weihong began befriending Sun Zhengcai, then-Party Secretary of Beijing's Shunyi District, in 2001, laying the foundation for her future political connections.