Help me find this manhwa

So the FL is blonde and she suspects that the ml is a serial killer (he's not lol he's actually a cutie patootie) FL is blonde I forgot the ml's hair:( it's historical and a typical "I reincarnate as villainess" story. I forgot where I left off but I believe the last chapter that I read before forgetting the title is when the FL got framed for hurting/slapping that black hair b!tch so the FL really slapped her for real this time.