There is this isekai manga that I read a while back and I completely forgot its name. When I started it was only a few chapters in so I forgot to bookmark it.
The first few chapters are where there is this male protag who gets isekaied into a FW where he is found by this lady knight(?). What happens is that he is pretty underhanded, realistic and lowkey looks out for himself. He also has this dead inside face. He doesn't have honor, chivalry etc which the lady knight has a lot of.
The first part is when they have to take down bandits, so the lady knight and her soldiers go and aim to stop the bandits with the aid/interference of a very misogynist man. The MC is the one who came up with the plan so he decides to participate. But what he doesn't tell the lady knight is that with his plan the bandit guy will not encounter her but the ML instead. The reason he doesn't tell her is because he decided to kill the bandit guy and he used underhanded methods to do it which of course the FL hates.