Later Gim Busik himself provided an example of temporizing in the correspondence with the Jin, arguing why Goryeo cannot be its vassal. In his book "Gaoli tujing" Xu Jing (1091-1153), a member of the Song mission to Goryeo in 1122-1123, mentions Gim Busik. Early years of the reign of Injong (1122-1126) were dominated by Yi Cha-gyeom, his maternal grandfather. Shortly after Injong took the throne, Kim was an executive, and in 1124 was promoted to the position of the fourth secretary in the Ministry of Rites ("Yebu Sirang"). Using his position Kim opposed Yi Cha-gyeom hold on power, aiming at Yi's attempts to enhance his public image. Already in 1122 Kim argued against giving special recognition to Yi Cha-gyeom as king’s grandfather. Later he questioned the appropriateness of calling Yi’s birthday "Insujel" (Celebrating Humaneness and Longevity), and a planned performance of the ritual music at the Yi’s family graves. Nevertheless, after a failed coup against Yi in early 1126 Gim Busik not only remained in power, but was promoted to the position of the Chief Censor. The role of Gim Busik in toppling Yo Cha-gyeom is unknown. Kim Bu-il, on the other hand, was one of the intermediaries between Injong and Yi‘s military supporters, inducing them to defect. After 1126 Kim brothers advanced through the Security Council into the highest offices. In 1135-1136 Kim Busik was in charge of suppressing the rebellion of Myo Cheong and rooting out his adherents in Kaesong He became the supreme chancellor in 1136 and dominate the Goryeo government till his official retirement in 1142. In 1142, Injong ordered the compilation of the "Samguk Sagi", a chronicle of events in the Three Kingdoms and Unified Silla. Using Chinese histories (particularly Shiji by Sima Qian), Gim Busik at the head of the fourteen-author team compiled the oldest extant source on Korean history. It was submitted to Injong in late 1145 or early 1146. Samguk Sagi(“The History of the Three Kingdoms of Korea”) is the oldest extant work of Korean history and often the only written source of information about the Three kingdoms and Unified Silla periods  Ideological and religious opinions of Gim Busik fell into the spectrum of practices of the upper strata of the Goryeo society.