Its a specific title, so i will try to jot down everything that I remember.
So the mc is engaged to the fl, but she really doesnt like him for some reason. To try and win her heart, he becomes like a servant to her (subservient), and thats for like the first few chapters.
But then, something happened and its revealed that the mc is actually the leader of some sort of underground crime organization in the dark and behind her back and is called "the sage" or something by the people who know who he is.
And yeah the premise, its really weird but that was all that i could recall
Some of fl's friends know him or something? and they try to warn fl but shes like "hes so pitiful how could he be this crime boss".
and another note, fl was really rude to mc at the beginning, like not even tsundere type but just no interest
then stuff happened and romance began