Im looking for a worldhopping system bl novel. I remember one arc vividly. The Mc transmigrates into a prince who is disguised as a princess. He is the beloved younger sister of the current emperor. The Mc job is to stop the female protagonist from I think making a harem. Mc marries one of her capture targets and works against her from the shadows by solving or helping the other capture targets before she can. One of the characters notices that he is targeting her and asks him why. He replies with something along the lines that she and his husband had something going on. (not true) The MC husband figures out that he is a male and still loves him and keeps his secret. He found out he was male when he followed him meeting one of the capture targets (the would be future prime mister i think)
Thank you so much. I read so many novels and it isnt until recently that I decided I need to write them down instead of taking screen shots on my phone.