Hi, can anyone tell me if you know the title of a book about an assassin guy from fantasy world then he got reincarnated to the modem world. His family is only his sister. He didn't want people knowing he is strong. He made sure to kill people that his client wanted to eliminated as long as their is a payment. Payment can even be a single coin or something else that's actually not valuable. Ge claim he is not a good person but his client were actually victim of circumstances they can't escape. He's basically helping them from others pointbof view aside from himself.
I forgot the name of a book.