I'm A Hitman Reincarnated Into a Knight

In the world of mafia where danger is everywhere. There are three best hitmen known in the mafia world and one of them is known as 'Reaper' but no one knows her real name. One day while meeting a client, the woman got betrayed and when she thought she was about to die she woke up in an unfamiliar place 'where the hell am i??'. She got reincarnated as Ren the daughter of a Marquess. The art on the cover is not mine. ctto