The Remarried Empress, Vol. 4 (manga)

Rashta is getting increasingly frantic as more and more people threaten her position and security—one of them being Navier’s brother, Kosair. Kosair doesn’t have the reservations Navier does about retaliating against the mistress, and is willing to go to great lengths to protect his sister...including kidnapping Viscount Lotteshu! Will he find out about Rashta’s hidden past and secret child?