An Emissary of No Return retells the story of a real historical event in 1907 known as the Hague Secret Emissary Affair. Korea had been colonized by Japan. In order to protest to the international community, the Korean emperor king Gojong sent three secret emissaries to the talks of the Hague Convention of 1907, to get the great powers to overturn the Japan–Korea Treaty of 1905.
| Actor | Role |
|---|---|
| KKim Jun-sikRi Jun | Ri Jun |
| CChang-su ChoeNot listed | Not listed |
| SSon Dae-wonNot listed | Not listed |
| RRyang Hye-sungNot listed | Not listed |
| KKim Yoon-hongNot listed | Not listed |
| KKim Jung-hwaNot listed | Not listed |
| OOk-hui KimNot listed | Not listed |
 Miloslav HomolaNot listed | Not listed |
| HHwang MinNot listed | Not listed |
 Ming-hui KimNot listed | Not listed |
 Jana KasanováMarianna | Marianna |
| KKim Young-keunNot listed | Not listed |
 Mun Ye-bongNot listed | Not listed |
| MMilan RiehsNot listed | Not listed |
 Miroslav ZounarNot listed | Not listed |