After the State of Qi seized the throne, it killed Boyi, the heir of Yu, and established a hereditary family system, which spread to the whole country. The Youhu tribe with the same surname as Qi (now Huxian County, Shaanxi Province) refused to accept it and encouraged soldiers to attack, which was defeated by Youhu. In order to win the hearts of the people, Kay was strict with himself and lived a simple life. He also respects the old and loves the young, and appoints talents. Then, with the support of the people, they sent troops again to attack and destroy the Youhu family and consolidate the throne. After that, he changed his previous style, and his life became corrupt, drinking, singing, dancing and hunting all day. Legend has it that he once created a large-scale music and dance called Jiu Shao.
When Qi was old, his "five" sons fought fiercely for the right of inheritance. The youngest son, the military attache (said to be the younger brother), was exiled to the west bank of the Yellow River (now Dai Yi, Shaanxi) because of the fiercest struggle. Wu Guan gathered people to revolt, and the State of Qi sent general Peng Boshou to lead troops to defeat him and take him to see the State of Qi. Wu Guan had to plead guilty and admit defeat. Soon, Kay died of excessive debauchery.