A powerful duke who can't get rid of one measly duchess.. If I where him I would have her assassinated..
In the first place he should have his stance and never married her even if it's an imperial order..
Second even if he couldn't escape being married to the duchess.. ultimately he is still the owner of the duchy, how come he can't control the servants especially the arrogant Masa.. he can start by firing her
And the duchess power is only borrowed from him.. he has the ability to suppress her but the only thing he can do is throw empty verbal threats and using a mistress for psychological warfare.. like boy be more assertive.. the women are doing most of the work here
Thank you for the update
This chapter is bittersweet