There was this manga I read (Shoujo or Seinen) where the main character is this rich guy that always gets kidnapped or targeted by assassins so much that he finds it to be normal and doesn't even flinch anymore. The girl is the new maid (red hair I think) but she's clumsy and is secretly his bodyguard.
The guy pretends to be weak and defenseless but he's actually strong.
maybe crimson empire? meets almost all of the criteria... if its not im still looking
________________ Hey there~! wanna find a manga? if so i can help you out most definitely! just say the plot and ill rack my brain for it! i love finding series for people >.< btw if you read fanfiction check me out purease https://www.fanfiction.net/~animegirl101100 I love getting reviews. *Honest Walker*