日韓 にっかん併合 へいごう条約 じょうやくでしょう
nikkanheigōjōyakudeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 日韓併合条約

1. Probably the Japan-Korea Annexation Treaty.

Polite
Presumptive
Conjecture