Was there a novel that was set in a remote village where the male protagonist lived with an old man and the old man taught him martial arts?

The male protagonist and an old man lived in a remote village. The old man taught him martial arts or something. The beginning of the novel seemed to be the male protagonist and a small constable disguised as a man.(This little constable seems to be a princess or a princess.) He went to a place that looked like a ghost shop to investigate a case. Many people died. He remembered it was a little scary. After that, he saved a pregnant woman from a minority race. Later on, he seemed to have made a person's corpse (I think it was the old man who lived with the male protagonist) into a poison source and placed it in the city to harm people. The male protagonist seemed to use a knife. It was quite famous! I only remember this bit of content. Have you read it yet? I'm begging for the title! Gods, please help!

Answer 1

In "The Beacon Era," the male protagonist grew up in a deserted village with an eccentric old blacksmith who taught him martial arts. I hope you like this fairy's recommendation. Muah ~😗