My Vengeful Former Lover

‘Even if our marriage, which the emperor has decided, becomes my revenge on you. Shouldn’t you endure it, my lovely bride?’
* * *
When her father’s strategy, which led to rebellion in the neighboring country to make his son-in-law king, had failed, Deatrice, who lost her fiance, ended up getting engaged with the emperor’s favorite knight to avoid the crisis that befell her family.
As the duke’s daughter, marrying a knight was a shame. What’s even worse was that the person she had to marry, the emperor’s favorite knight, was Lucius Elliot. He was her former lover, who she had to break up with because of her father’s opposition six years ago.
Lucius was a passionate and affectionate lover. However, he lost his title and his land and was pushed to the battlefield after he was proven to be an illegitimate child by the Deatrice’s father’s trick.
Six years later, the two of them faced each other with the situation reversed, bearing the bad memories of the past. Deatrice was becoming heartbroken by Lucius’ action, which she couldn’t tell whether it’s an act of revenge or regret…