Kono to Ai wa Chi Yori Koku

"Choose for yourself. Will you be executed right here, or will you become the wife of the man who beheaded your father?" Juno, the princess of a small kingdom, was raised as a sheltered daughter by her kind father, the King. She had been eagerly awaiting her marriage to her gentle fiancé, Leif, the Second Prince of a neighboring country. However, her reunion with Leif takes place in front of her father's blood-stained corpse. Leif had suddenly attacked Juno's country with his army, conquering it with lightning speed. "Murderer!" Juno cries out, blaming him. Leif coldly tells her, "As of this moment, I am breaking our engagement." He continues, "Choose for yourself. Will you be executed here, or become the wife of the man who beheaded your father?" Juno realizes he intends to humiliate her by forcing her to make the choice herself. For the sake of her people, she chooses to become his wife. Her new purpose: to survive, even if she has to crawl through the mud, and exact her revenge on him. But there is one thing she hasn't noticed. The hidden affection that still lingers within Leif's eyes...

Original Webtoon

https://ebookjapan.yahoo.co.jp/books/943279/