The envoy had strong suggestion of military alliance at the initial stage, and Japan side treated the envoy from Bo Hai very well as Japan viewed it as he/she visited Japan by the emperor's influence by virtue.
初期の段階では軍事同盟としての色彩が強い使節であり、また日本側も渤海が天皇の徳化により来朝したと捉え、使節を非常に厚遇している。