Remarried empress (Manhwa)

"Navier Ellie Trovi was the lifelong companion of Sovieshu, the emperor of the Eastern Empire, with whom she spent her youth discussing the empire they would build together. She was intelligent, compassionate, and courageous. She was the perfect empress of the Eastern Empire, until the day Sovieshu fell for another woman, demanding a divorce. However, it was Navier who shocked Sovieshu, his beloved mistress, and a speechless court as she coldly declared:...

"Now that Navier knows the identity of her pen pal, she's happy to find herself growing closer to Heinrey. But things aren't that simple for an empress--not everyone is quite so pleased about their friendship, and the charming prince himself seems to be hiding something big...Meanwhile, Rashta's secret has been exposed, leaving her backed into a corner. With threats looming over her head and Sovieshu's eye trained on Navier, just how far is Rashta...