i read this manhwa last year ig but can't remember it's name. the fl either got isekaied ...

i read this manhwa last year ig but can't remember it's name. the fl either got isekaied or was repeating her life but

she was a psycho serial killer and her family and butler knew it and were trying to hide the fact that they knew she was the killer and covering up tracks for her (like burying the body or burning remains etc ). im not entirely sure about the details but for some reason i remember that initially she herself wasn't consciously aware that she was doing the killings (this part I'm unsure about if this was the case or not ) . does any knows it's name ?