I Only Treat Villains

"One day a crazy person knocked on my door."

My house is a jewel shop.
Someone keeps bringing people in front of my house. Since I keep getting involved in many people's business, I treat them while cursing.

"Didn't you save the head of an assassin's guild last time?"
"She was a woman."
"Oh, what about the vicious loan shark who owns a billion marks on Second Avenue?"
"She's a woman, too."
"What about the person who dropped you off in front of your house and left in a noble's carriange?"
"She was a young lady."

But the day that brought the 6th person. For the first time, a man came. A very handsome man.

Promotional Manhwa of a Novel with the same name.