
and this is the summary
In the 13th century, Poland's Puotsk region, the territory of the Krömer family, where German knights were sent and stationed, was a place where public trade was active and prisoners of other ethnicities were enslaved. A man with a big ax without a pass appears in front of the gatekeeper, Andy, and suddenly attacks Andy who asks for the pass.

Looks like it is serialized in Korean only on lehzh*n under the title "The Black Dog's Slave Prince." You won't find it on lehzh*nus.com since it hasn't been translated. It has 35 chapters.
To be honest, I'm wondering how this back story would fit with Hound's and Anjay's storyline and implied relationship.
Does anyone knows where i can find story of Roxant's brother nad his lover, they look so lovely as well