Hall of Worthies
The Six were Seong Sam-mun, Pak Paeng-nyeon, Ha Wi-ji, Yi Gae, Yu Eung-bu, and Yu Seong-won. Most were members of the Hall of Worthies, a royal research institute, who had been appointed by King Sejong. Both King Sejong and King Munjong had charged them with looking after King Danjong (son and grandson respectively), and they reacted with outrage to Sejo's usurpation of the throne in 1455. Together with Kim Jil, they plotted a coup to coincide with the visit of a Ming Dynasty envoy. When the banquet and subsequently the assassination plot were postponed, Kim Jil lost his heart and betrayed the plot to his father-in-law, who reported to Sejo. The Six except Yu Seong-won, who committed suicide with his wife, were seized and tortured.