In 1506, the 12th year of Yeonsangun, a group of officials – notably Pak Wŏnjong, Sŏng Hŭian, Yu Sunjŏng and Hong Kyŏngju plotted against the despotic ruler. They launched a coup on September 2, 1506, deposing the king and replacing him with his half-brother, Grand Prince Jinseong. The king was demoted to prince, and exiled to Ganghwa Island, where he died a few weeks later. Consort Jang Nok-su, who was regarded as a femme fatale who had encouraged Yeonsangun's misrule, was beheaded. Yeonsangun's young sons were also killed.
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Text from the Wikipedia article “Jungjong coup”, available under CC BY-SA 4.0.