[Why] After seizing power Houyi repeated Taikang's mistake, indulging in archery and pleasure while delegating government to his trusted minister Han Zhuo. The balance between old Xia officials and the new Eastern Yi nobility ruptured, brewing a second coup. [What] Han Zhuo secretly bought loyalty and cultivated his own faction, eventually launching a coup that killed Houyi and seized power. He then hunted down the Xia royal line with savage zeal, plunging the Xia clan into existential peril. [Who] Houyi was undone by his preference for martial pleasure over governance, ultimately devoured by his own subordinate. Han Zhuo is remembered as one of the most sinister and brutal usurpers in early Chinese memory, while the Xia heir Xiang was killed and Queen Min was forced into exile. [How] These successive coups paralyzed Xia rule entirely and threatened a serious cultural regression for Huaxia. They constitute the most intense and savage prehistoric clan power struggle ever recorded in Chinese dynastic history.
Why
The historic event of Usurpation of Yi and Zhuo represents a key developmental peak of the Huaxia dynastic system. The most intense prehistoric clan power struggle in dynastic history. By establishing this moral or administrative benchmark, it continues to shape the structural and philosophical fabric of ancient Chinese statecraft.