Kim Busik compiled the Samguk sagi, the medieval Korean chronicle containing the Gabae story linked to Chuseok.
Kim Busik was a prominent Goryeo official, historian, and scholar. He led the work on the Samguk sagi under King Injong, producing an official history of the earlier Korean kingdoms. The chronicle was completed in 1145.
Its account of Gabae describes a Silla-era weaving competition associated with the court of King Yuri. Because the story connects seasonal competition, food, and communal celebration, it became an important traditional explanation for Chuseok’s ancient background.
Kim Busik’s work is not a Chuseok festival manual. It is a broader political and historical chronicle, and its references to customs must be read in that context. The later holiday developed through many historical changes and regional traditions.