Kublai had ordered them strictly to deliver the imperial letter to Japan and "not to give up for a reason attributable to bad weather," and thus, when both envoys returned without crossing the sea due to the reason of 'bad weather,' he got upset and did not accept it.
クビライは予め「風濤の険阻を以って辞となすなかれ」と日本側への国書の手交を厳命していたが、その「風濤の険阻」を理由に使者の両名は渡海もせず引き返してきたことに憤慨してこれを却下した。