In 1907, after the conclusion of the treaty, the dispatch of the secret agent who carried a personal letter of Gao Zong (King of Korea) that insisted on invalidity of the treaty was exposed (the Hague Secret Emissary Affair).
協約締結後の1907年に、協約の無効を主張する高宗(朝鮮王)の親書をたずさえた密使の派遣が露見する（ハーグ密使事件）。