One opinion is as follows: Use of the title of 'King' and the 'Oriental zodiac' was a residue of the China-centered sakuho (homage by Chinese emperors) system, indicating the traditional eastern Asian diplomatic order with China placed at the top and nations around it considered dependent on China, and it was time to try separating from such a system and to make such a situation acknowledged by the Korean side as well.
そもそも「国王」称号や「干支」の使用は中華秩序における冊封体制の残滓であり、中華帝国を頂点として周辺諸国を従属国視する、伝統的東アジア外交秩序そのものであり、いまこそ、その体制から離脱を図り、かつ朝鮮側にもそれを認知させようとしたのだ、という論である。