Since the pseudo Ojo-daijin envoy had interaction with Korea during this period, the Yoshimasa's proposal matched the intention of the Yi Dynasty that wanted to subdue the pseudo envoys, Gafusei was to be introduced.
この時期、偽の王城大臣使が朝鮮に通交しており、義政の申し入れは偽使抑制を願う朝鮮王朝の思惑と一致し、牙符制が導入されることになる。