I Got Proposed to by my Ex-husband’s Younger Brother

“Marry me. There is nothing more certain than a marriage alliance.”
On the day her husband became emperor, her father was accused of being a traitor.
Azrael Nocturne, who was unjustly executed along with the destruction of her family, swore an oath after returning by the arrangement of the goddess.
‘I will take revenge on the crown prince and Angela, and protect my family.’
Feeling betrayed by her trusted husband and friend, she does not plan on marrying or even loving in this life.
In order to prevent her ex-husband from becoming emperor, she approached his half-brother, Prince Leonard.
“I want to help you reach the highest position.”
“What on earth are you thinking? Are you serious?”
He lowered his face as if to kiss her. Azrael’s heart began to beat faster as he remembered the moment they had been close to each other a few days ago.
“Marry me. If you truly want me to become emperor.”