Shinai Naru Koutaishi-sama, Imayo wa Watashi ga Mamorimasu

Robbed of her fiancé and falsely accused, the duke’s daughter Else meets her tragic end, only to return to the morning of her broken engagement! Before her death, Else was condemned in front of the nobility by her betrothed, King Anzeum, who coldly declared their engagement annulled. To make matters worse, her only ally, the neighboring Crown Prince, Lucas, was slain before her very eyes. Stripped of everything and drowning in despair, Else’s life ended in silence.But when she opened her eyes, she had returned to that very morning, the day of the annulment. 
“This time, I will devote my second life to Lucas, the man who believed in me.” With this vow, Else begins to take actions different from her previous life, each step reshaping her fate. Original Webtoon